feat: initial implementation of anki-mcp MCP server

Implements a FastMCP server that wraps AnkiConnect (localhost:8765)
to expose Anki flashcard management as Claude MCP tools.

Tools provided:
- list_decks: list all deck names
- create_deck: create nested decks (:: separator)
- add_card: add Basic flashcard with optional tags
- get_due_cards: fetch today's due cards with optional deck filter
- update_card: edit front/back of existing note
- update_deck: rename deck (move-cards approach)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

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+.env
+.venv/
+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/
+*.egg-info/
+dist/
+build/
+.DS_Store