feat: implement config routes

[2witstudios]

Summary

• Adds read-only Fastify route plugin (src/server/routes/config.ts) with three endpoints:
  • GET /api/config — returns agent configuration from config.yaml merged with defaults
  • GET /api/templates — lists templates with source tracking (local vs global), descriptions, and template variables
  • GET /api/prompts — lists prompts with deduplication across local/global directories, descriptions, and variables
• Adds Fastify and @fastify/cors dependencies
• 11 tests covering all three endpoints with mocked filesystem

Test plan

• npm run typecheck passes
• npm test — all 229 tests pass (22 files)
• Config endpoint returns defaults when no config.yaml exists
• Config endpoint merges user overrides with defaults
• Templates endpoint returns source tracking and variable extraction
• Prompts endpoint deduplicates local over global
• Both templates and prompts handle missing directories gracefully

Closes #72

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and 15ef3b9.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (7)

• package.json
• src/commands/list.ts
• src/commands/spawn.test.ts
• src/core/prompt.test.ts
• src/core/prompt.ts
• src/server/routes/config.test.ts
• src/server/routes/config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ppg/issue-72-config-routes

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