feat: add per-lane scheduler status API and lane worker UI pages

- GET /api/plugin/lanes returns all lanes with status and job types
- GET /api/plugin/workers?lane=X filters workers by lane
- GET /api/plugin/scheduler-states?lane=X filters job types by lane
- GET /api/plugin/scheduler-status?lane=X returns lane-scoped status
- GET /plugin/lanes/{lane}/workers renders per-lane worker page
- SchedulerJobTypeState now includes a "lane" field

The lane worker pages show scheduler status, job type configuration,
and connected workers scoped to a single lane, with links back to
the main plugin overview.

weed/admin/view/app/plugin_lane.templ

@@ -0,0 +1,167 @@
+package app
+
+templ PluginLane(page string, lane string) {
+    {{
+        currentPage := page
+        if currentPage == "" {
+            currentPage = "lane_workers"
+        }
+    }}
+    <div class="container-fluid" id="plugin-lane-page" data-plugin-page={ currentPage } data-plugin-lane={ lane }>
+        <div class="row mb-4">
+            <div class="col-12">
+                <div class="d-flex justify-content-between align-items-center flex-wrap gap-2">
+                    <div>
+                        <h2 class="mb-0"><i class="fas fa-layer-group me-2"></i>{ lane } Lane Workers</h2>
+                        <p class="text-muted mb-0">Workers and scheduler status for the { lane } scheduling lane.</p>
+                    </div>
+                    <div class="btn-group">
+                        <a href="/plugin" class="btn btn-outline-secondary">
+                            <i class="fas fa-arrow-left me-1"></i>All Workers
+                        </a>
+                        <button type="button" class="btn btn-outline-secondary" id="plugin-lane-refresh-btn">
+                            <i class="fas fa-sync-alt me-1"></i>Refresh
+                        </button>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="row mb-3">
+            <div class="col-12">
+                <div class="card">
+                    <div class="card-header">
+                        <h5 class="card-title mb-0"><i class="fas fa-server me-2"></i>Lane Scheduler Status</h5>
+                    </div>
+                    <div class="card-body" id="plugin-lane-scheduler-status">
+                        <div class="text-center text-muted py-3">
+                            <i class="fas fa-spinner fa-spin me-1"></i>Loading scheduler status...
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="row mb-3">
+            <div class="col-12">
+                <div class="card">
+                    <div class="card-header">
+                        <h5 class="card-title mb-0"><i class="fas fa-tasks me-2"></i>Job Types</h5>
+                    </div>
+                    <div class="card-body" id="plugin-lane-job-types">
+                        <div class="text-center text-muted py-3">
+                            <i class="fas fa-spinner fa-spin me-1"></i>Loading job types...
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="row">
+            <div class="col-12">
+                <div class="card">
+                    <div class="card-header">
+                        <h5 class="card-title mb-0"><i class="fas fa-plug me-2"></i>Connected Workers</h5>
+                    </div>
+                    <div class="card-body" id="plugin-lane-workers">
+                        <div class="text-center text-muted py-3">
+                            <i class="fas fa-spinner fa-spin me-1"></i>Loading workers...
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <script>
+    (function() {
+        const page = document.getElementById('plugin-lane-page');
+        if (!page) return;
+        const lane = page.dataset.pluginLane || '';
+        if (!lane) return;
+
+        function fetchAndRender(url, containerId, renderFn) {
+            fetch(url)
+                .then(r => r.json())
+                .then(data => {
+                    const el = document.getElementById(containerId);
+                    if (el) el.innerHTML = renderFn(data);
+                })
+                .catch(err => {
+                    const el = document.getElementById(containerId);
+                    if (el) el.innerHTML = '<div class="alert alert-danger">Failed to load: ' + err.message + '</div>';
+                });
+        }
+
+        function renderSchedulerStatus(data) {
+            if (!data || !data.scheduler) return '<div class="text-muted">No scheduler data</div>';
+            const s = data.scheduler;
+            let html = '<div class="row">';
+            html += '<div class="col-md-3"><strong>Phase:</strong> ' + (s.current_phase || 'idle') + '</div>';
+            html += '<div class="col-md-3"><strong>Idle Sleep:</strong> ' + (s.idle_sleep_seconds || 0) + 's</div>';
+            html += '<div class="col-md-3"><strong>Current Job Type:</strong> ' + (s.current_job_type || '-') + '</div>';
+            html += '<div class="col-md-3"><strong>Next Detection:</strong> ' + (s.next_detection_at ? new Date(s.next_detection_at).toLocaleTimeString() : '-') + '</div>';
+            html += '</div>';
+            if (s.job_types && s.job_types.length > 0) {
+                html += '<hr><table class="table table-sm table-hover mb-0"><thead><tr><th>Job Type</th><th>Enabled</th><th>Interval</th><th>In Flight</th><th>Next Detection</th></tr></thead><tbody>';
+                s.job_types.forEach(jt => {
+                    html += '<tr>';
+                    html += '<td>' + jt.job_type + '</td>';
+                    html += '<td>' + (jt.enabled ? '<span class="badge bg-success">Yes</span>' : '<span class="badge bg-secondary">No</span>') + '</td>';
+                    html += '<td>' + (jt.detection_interval_seconds || '-') + 's</td>';
+                    html += '<td>' + (jt.detection_in_flight ? '<span class="badge bg-warning">Yes</span>' : 'No') + '</td>';
+                    html += '<td>' + (jt.next_detection_at ? new Date(jt.next_detection_at).toLocaleTimeString() : '-') + '</td>';
+                    html += '</tr>';
+                });
+                html += '</tbody></table>';
+            }
+            return html;
+        }
+
+        function renderJobTypes(data) {
+            if (!data || data.length === 0) return '<div class="text-muted">No job types in this lane</div>';
+            const filtered = data.filter(s => s.lane === lane);
+            if (filtered.length === 0) return '<div class="text-muted">No job types in this lane</div>';
+            let html = '<table class="table table-sm table-hover mb-0"><thead><tr><th>Job Type</th><th>Enabled</th><th>Concurrency</th><th>Detection Interval</th><th>Status</th></tr></thead><tbody>';
+            filtered.forEach(s => {
+                html += '<tr>';
+                html += '<td><a href="/plugin/configuration?job=' + s.job_type + '">' + s.job_type + '</a></td>';
+                html += '<td>' + (s.enabled ? '<span class="badge bg-success">Yes</span>' : '<span class="badge bg-secondary">No</span>') + '</td>';
+                html += '<td>' + (s.global_execution_concurrency || 1) + '</td>';
+                html += '<td>' + (s.detection_interval_seconds || '-') + 's</td>';
+                html += '<td>' + (s.last_run_status || '-') + '</td>';
+                html += '</tr>';
+            });
+            html += '</tbody></table>';
+            return html;
+        }
+
+        function renderWorkers(data) {
+            if (!data || data.length === 0) return '<div class="text-muted">No workers connected for this lane</div>';
+            let html = '<table class="table table-sm table-hover mb-0"><thead><tr><th>Worker ID</th><th>Address</th><th>Job Types</th><th>Connected</th><th>Last Seen</th></tr></thead><tbody>';
+            data.forEach(w => {
+                const jobTypes = Object.keys(w.Capabilities || {}).join(', ');
+                html += '<tr>';
+                html += '<td>' + (w.WorkerID || '-') + '</td>';
+                html += '<td>' + (w.Address || '-') + '</td>';
+                html += '<td>' + jobTypes + '</td>';
+                html += '<td>' + (w.ConnectedAt ? new Date(w.ConnectedAt).toLocaleString() : '-') + '</td>';
+                html += '<td>' + (w.LastSeenAt ? new Date(w.LastSeenAt).toLocaleString() : '-') + '</td>';
+                html += '</tr>';
+            });
+            html += '</tbody></table>';
+            return html;
+        }
+
+        function refresh() {
+            fetchAndRender('/api/plugin/scheduler-status?lane=' + lane, 'plugin-lane-scheduler-status', renderSchedulerStatus);
+            fetchAndRender('/api/plugin/scheduler-states?lane=' + lane, 'plugin-lane-job-types', renderJobTypes);
+            fetchAndRender('/api/plugin/workers?lane=' + lane, 'plugin-lane-workers', renderWorkers);
+        }
+
+        refresh();
+        const btn = document.getElementById('plugin-lane-refresh-btn');
+        if (btn) btn.addEventListener('click', refresh);
+    })();
+    </script>
+}