Initial commit: Backend with Bun.serve() + Drizzle ORM

- Bun 1.3.6 server setup
- MariaDB schema (projects, agents, tasks)
- Auto-migrations on startup
- WebSocket support
- Health check endpoint

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

src/db/migrate.ts

@@ -0,0 +1,39 @@
+/**
+ * Database Migrations Runner
+ * Runs automatically on app startup
+ */
+
+import { drizzle } from 'drizzle-orm/mysql2'
+import { migrate } from 'drizzle-orm/mysql2/migrator'
+import mysql from 'mysql2/promise'
+
+export async function runMigrations() {
+  console.log('🔄 Running database migrations...')
+
+  const connection = await mysql.createConnection({
+    host: process.env.DB_HOST,
+    port: parseInt(process.env.DB_PORT || '3306'),
+    user: process.env.DB_USER,
+    password: process.env.DB_PASSWORD,
+    database: process.env.DB_NAME,
+  })
+
+  const db = drizzle(connection)
+
+  try {
+    await migrate(db, { migrationsFolder: './drizzle/migrations' })
+    console.log('✅ Migrations completed successfully')
+    await connection.end()
+    return true
+  } catch (error) {
+    console.error('❌ Migration failed:', error)
+    await connection.end()
+    throw error
+  }
+}
+
+// Run if executed directly
+if (import.meta.main) {
+  await runMigrations()
+  process.exit(0)
+}