feat: v1.5 — ChatGPT Actions Integration

[devwhodevs]

Summary

• OpenAPI 3.1.0 spec (openapi.rs) — hand-written spec for all 23 endpoints, served at GET /openapi.json (no auth)
• ChatGPT plugin manifest — served at GET /.well-known/ai-plugin.json (no auth)
• --setup-chatgpt CLI helper — interactive setup: enables HTTP, creates API key, configures CORS for chat.openai.com, prompts for public URL
• Plugin config — [http.plugin] section for name, description, contact_email, public_url
• ChatGPT Actions compatible — flat schemas (no oneOf/anyOf), < 300 char descriptions, bearer auth, CORS

Stats

Metric	Before	After
Modules	25	26
Tests	417	426

Test plan

• cargo test --lib — 426 pass
• cargo clippy -- -D warnings — 0 warnings
• cargo fmt --check — clean
• /openapi.json served with no auth — valid 3.1.0 spec with 23 endpoints
• /.well-known/ai-plugin.json served with no auth — valid manifest
• --setup-chatgpt flag visible in help
• Search via HTTP still works