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

.gitignore

@@ -4,3 +4,4 @@ workspaces/
 credentials/
 dist/
 repos/
+.turbo/