feat: add loader service and universal entrypoint

[Teagan42]

What

• add mcp-server uv script
• introduce universal entrypoint.sh for Docker image
• run loader alongside server in docker-compose
• document new commands

Why

• allow container to run either the loader or server from the same image
• make docker-compose orchestrate data loading and server simultaneously

Affects

• Dockerfile, docker-compose, entrypoint, pyproject, README, lock file

Testing

• uv run ruff check .
• uv run pytest

Documentation

• updated README.md

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https://chatgpt.com/codex/tasks/task_e_68bfaae467148328be3fcb2244e4f6c9

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex
loader.py	186	16	91%	32–34, 301, 304–307, 352–361, 599, 605
server.py	190	22	88%	75, 93–94, 205–221, 313, 317, 337–341, 374
TOTAL	478	38	92%

Tests	Skipped	Failures	Errors	Time
19	0 💤	0 ❌	0 🔥	16.806s ⏱️