refactor: migrate to Turborepo + pnpm + Biome monorepo

Restructure into apps/worker, apps/cli, packages/mcp-server with
Turborepo task orchestration, pnpm workspaces, Biome linting/formatting,
and tsdown CLI bundling.

Key changes:
- src/ -> apps/worker/src/, cli/ -> apps/cli/, mcp-server/ -> packages/mcp-server/
- prompts/ and configs/ moved into apps/worker/
- npm replaced with pnpm, package-lock.json replaced with pnpm-lock.yaml
- Dockerfile updated for pnpm-based builds
- CLI logs command rewritten with chokidar for cross-platform reliability
- Router health checking added for auto-detected router mode
- Centralized path resolution via apps/worker/src/paths.ts

docker-compose.yml

@@ -34,7 +34,7 @@ services:
     ports:
       - "127.0.0.1:3456:3456"
     volumes:
-      - ./configs/router-config.json:/config/router-config.json:ro
+      - ./apps/cli/infra/router-config.json:/config/router-config.json:ro
     environment:
       - HOST=0.0.0.0
       - ANTHROPIC_API_KEY=${ANTHROPIC_API_KEY:-}