Add skeleton docs/patterns.md with type-checked companion file

Introduces a patterns documentation page for common MCP Apps recipes.
The skeleton includes TODO sections for: perceived latency, iframe/MCP Apps
coexistence, authenticated calls, private tools, theme changes, fullscreen,
host styling, data persistence, OpenAI migration, and error handling.

- Add `docs/patterns.md` to `projectDocuments` in `typedoc.config.mjs`
- Add `docs/patterns.ts` companion file with region-delimited code stubs
- Include `docs/**/*.ts` in `tsconfig.json` for type-checking
- Document the standalone docs pattern in `CLAUDE.md`

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tsconfig.json

@@ -15,6 +15,6 @@
     "skipLibCheck": true,
     "resolveJsonModule": true
   },
-  "include": ["src/**/*.ts", "src/**/*.tsx"],
+  "include": ["src/**/*.ts", "src/**/*.tsx", "docs/**/*.ts"],
   "exclude": ["node_modules", "dist", "examples/**/*.ts"]
 }