chore(v1.0.1): opus review findings — docstring confirmation patterns, pyproject.urls, gitignore fix, logging

**Critical:**
- Add IMPORTANT confirmation lines to toggle_task and like_post docstrings
- Add [project.urls] section with Gitea repository link to pyproject.toml

**Medium:**
- Fix .gitignore: test_*.py recursive pattern (remove leading slash)
- Add exception logging to clear_list() for failed deletions
- Update get_categories() docstring: clarify custom vs system category locale behavior
- Add Versioning Policy section to CHANGELOG.md

**Minor:**
- Fix CLI help text (remove "(read-only)" qualifier)
- Add language note to CLAUDE.md (German file, English code)
- Create tests/README.md with integration test documentation
- Update version to 1.0.1 in pyproject.toml

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -1,5 +1,8 @@
 # mcp-familywall
 
+**Note:** This file is intentionally written in German (developer preference).
+Code, docstrings, and commit messages are in English.
+
 ## Kontext
 
 Dieses Projekt entwickelt `mcp-familywall` – einen MCP-Server für den