refactor: initialize Qdrant client within PlexServer

[Teagan42]

What

• instantiate Qdrant client in PlexServer and expose as server.qdrant_client
• update server methods to use the new client attribute and adjust tests
• document architecture change and bump version to 0.26.10

Why

• centralizes Qdrant client state on the server instance and simplifies testing

Affects

• mcp_plex/server.py
• tests/test_server.py
• AGENTS.md, pyproject.toml

Testing

• uv run ruff check .
• uv run pytest

Documentation

• updated AGENTS.md to note the new client initialization location

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https://chatgpt.com/codex/tasks/task_e_68c64a12d3b4832892a04829b0bcaa7b

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex
loader.py	197	10	95%	32–34, 331, 334–338, 663
server.py	307	21	93%	91, 111–112, 234, 462, 466, 486–490, 522, 532, 563–564, 581–582, 605, 608–609, 668
TOTAL	608	31	95%

Tests	Skipped	Failures	Errors	Time
29	0 💤	0 ❌	0 🔥	32.848s ⏱️