feat: expose MCP components via REST

[Teagan42]

Summary

• add Swagger UI and generic REST routes for tools, prompts, and resources
• cover REST endpoints with integration test
• bump version to 0.26.5 and add fastapi dependency

Testing

• uv run ruff check mcp_plex/server.py tests/test_server.py
• uv run pytest

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https://chatgpt.com/codex/tasks/task_e_68c60bc95ed8832886c137a8d0968f97

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex
loader.py	189	10	95%	32–34, 310, 313–317, 642
server.py	285	40	86%	86, 104–105, 227, 455, 459, 479–483, 514–515, 531–542, 548–561, 608
TOTAL	577	50	91%

Tests	Skipped	Failures	Errors	Time
28	0 💤	0 ❌	0 🔥	39.074s ⏱️