feat: implement Phase 4 - Configuration Management

Features added:
- View all process configurations in sortable table
- Reload supervisord configuration with confirmation
- Add new process groups dynamically
- Remove process groups with confirmation
- Configuration auto-refresh every 10 seconds

Implementation details:
- Created config API routes: /api/supervisor/config (GET), /api/supervisor/config/reload (POST), /api/supervisor/config/group (POST/DELETE)
- Added React Query hooks: useConfig, useReloadConfig, useAddProcessGroup, useRemoveProcessGroup
- Created components:
  - ConfigTable: Sortable table with columns for group, name, command, directory, autostart, priority, numprocs
  - ReloadConfigButton: Reload config with confirmation dialog
  - ProcessGroupForm: Add/remove groups with separate forms

Configuration page features:
- Displays all process configurations in sortable table
- Click column headers to sort (ascending/descending)
- Visual indicators for autostart (green dot = enabled)
- Shows command in monospace code blocks
- Process group management forms
- Reload configuration button in header

Data displayed per process:
- Group name
- Process name
- Command (with syntax highlighting)
- Working directory
- Autostart enabled/disabled
- Priority value
- Number of processes (numprocs)

Phase 4 complete (8-10 hours estimated)

app/api/supervisor/config/group/route.ts

@@ -0,0 +1,60 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { createSupervisorClient } from '@/lib/supervisor/client';
+
+// POST - Add a process group
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json();
+    const { name } = body;
+
+    if (!name) {
+      return NextResponse.json(
+        { error: 'Group name is required' },
+        { status: 400 }
+      );
+    }
+
+    const client = createSupervisorClient();
+    const result = await client.addProcessGroup(name);
+
+    return NextResponse.json({
+      success: result,
+      message: `Process group '${name}' added successfully`,
+    });
+  } catch (error: any) {
+    console.error('Supervisor add process group error:', error);
+    return NextResponse.json(
+      { error: error.message || 'Failed to add process group' },
+      { status: 500 }
+    );
+  }
+}
+
+// DELETE - Remove a process group
+export async function DELETE(request: NextRequest) {
+  try {
+    const body = await request.json();
+    const { name } = body;
+
+    if (!name) {
+      return NextResponse.json(
+        { error: 'Group name is required' },
+        { status: 400 }
+      );
+    }
+
+    const client = createSupervisorClient();
+    const result = await client.removeProcessGroup(name);
+
+    return NextResponse.json({
+      success: result,
+      message: `Process group '${name}' removed successfully`,
+    });
+  } catch (error: any) {
+    console.error('Supervisor remove process group error:', error);
+    return NextResponse.json(
+      { error: error.message || 'Failed to remove process group' },
+      { status: 500 }
+    );
+  }
+}

app/api/supervisor/config/reload/route.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from 'next/server';
+import { createSupervisorClient } from '@/lib/supervisor/client';
+
+// POST - Reload configuration
+export async function POST() {
+  try {
+    const client = createSupervisorClient();
+    const result = await client.reloadConfig();
+    return NextResponse.json({
+      success: true,
+      message: 'Configuration reloaded',
+      result,
+    });
+  } catch (error: any) {
+    console.error('Supervisor reload config error:', error);
+    return NextResponse.json(
+      { error: error.message || 'Failed to reload configuration' },
+      { status: 500 }
+    );
+  }
+}

app/api/supervisor/config/route.ts

@@ -0,0 +1,17 @@
+import { NextResponse } from 'next/server';
+import { createSupervisorClient } from '@/lib/supervisor/client';
+
+// GET - Get all process configurations
+export async function GET() {
+  try {
+    const client = createSupervisorClient();
+    const configs = await client.getAllConfigInfo();
+    return NextResponse.json(configs);
+  } catch (error: any) {
+    console.error('Supervisor get config error:', error);
+    return NextResponse.json(
+      { error: error.message || 'Failed to fetch configuration' },
+      { status: 500 }
+    );
+  }
+}