add pipeline task system, agentic music tasks, copy buttons, and pi-bridge cleanup

- Pipeline mode: new task mode that chains agentic tasks sequentially with
  foreach/subdirectory iteration and skip_if conditions
- Pipeline executor backend (WebSocket at /api/tasks/pipeline/ws) with
  support for both Pi and Claude Code models
- Frontend PipelineRunner component with step progress, streaming output,
  and aggregate cost tracking
- New agentic tasks: prepare-discography, fetch-album-info, build-discography
  (pipeline combining both)
- Seed parser extended to handle pipeline steps in frontmatter config
- CopyButton component added to assistant bubbles, error bubbles, and
  tool input/output sections
- Removed obsolete SearXNG/Apify/browser relay code from pi-bridge

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/databases/officer_db/seed-tasks.ts

@@ -99,6 +99,59 @@ function parseFrontmatter(content: string) {
     }
   }
 
+  // Parse pipeline steps
+  const stepsMatch = yaml.match(/^steps:\s*\n((?:[ \t]+.+\n?)*)/m);
+  if (stepsMatch) {
+    const stepsBlock = stepsMatch[1]!;
+    const steps: Record<string, unknown>[] = [];
+    let currentStep: Record<string, unknown> | null = null;
+    let inInputs = false;
+    let stepInputs: Record<string, string> = {};
+
+    for (const line of stepsBlock.split('\n')) {
+      // New step entry (2 spaces + dash)
+      const stepStart = line.match(/^\s{2}-\s+task:\s*(.+)$/);
+      if (stepStart) {
+        if (currentStep) {
+          if (Object.keys(stepInputs).length > 0) currentStep.inputs = stepInputs;
+          steps.push(currentStep);
+        }
+        currentStep = { task: stepStart[1]!.trim() };
+        stepInputs = {};
+        inInputs = false;
+        continue;
+      }
+      if (!currentStep) continue;
+
+      // Step-level properties (4 spaces)
+      const propMatch = line.match(/^\s{4}(\w[\w_-]*):\s*(.*)$/);
+      if (propMatch) {
+        const key = propMatch[1]!;
+        const value = propMatch[2]!.trim();
+        if (key === 'inputs' && value === '') {
+          inInputs = true;
+        } else {
+          inInputs = false;
+          currentStep[key] = value;
+        }
+        continue;
+      }
+
+      // Step input entries (6 spaces)
+      const inputMatch = line.match(/^\s{6}(\w[\w_-]*):\s*(.+)$/);
+      if (inputMatch && inInputs) {
+        stepInputs[inputMatch[1]!] = inputMatch[2]!.trim();
+      }
+    }
+    if (currentStep) {
+      if (Object.keys(stepInputs).length > 0) currentStep.inputs = stepInputs;
+      steps.push(currentStep);
+    }
+    if (steps.length > 0) {
+      meta.config = { steps };
+    }
+  }
+
   return { meta, body };
 }
 
@@ -151,6 +204,7 @@ async function seedTasks() {
       args: (meta.args as string[]) || null,
       trigger: (meta.trigger as TriggerConfig[]) || null,
       inputs: (meta.inputs as Record<string, unknown>) || null,
+      config: (meta.config as Record<string, unknown>) || null,
     };
 
     // Upsert: check by dirName + scope since unique constraint doesn't work with NULL userId
@@ -174,6 +228,7 @@ async function seedTasks() {
           args: values.args,
           trigger: values.trigger,
           inputs: values.inputs,
+          config: values.config,
           updatedAt: new Date(),
         })
         .where(eq(tasks.id, existing[0]!.id));