fix(gitea): fix 15 failing tests and update documentation

Test Fixes:
- Fix mock_config fixture to use 'owner/repo' format (was separate fields)
- Update test_client_initialization to match current client API
- Add required 'org' argument to get_org_labels, list_repos, aggregate_issues tests
- Update error message assertion in test_no_repo_specified_error
- Fix test_create_issue to mock is_org_repo and label resolution
- Update aggregate_issues tests in test_issues.py with org argument

Documentation Updates:
- Expand tools table from 8 to 36 tools (organized by category)
- Update directory structure to show all 6 tool files
- Remove unused GITEA_OWNER from configuration docs
- Add automatic repository detection documentation
- Add project directory detection strategies
- Update test count from 42 to 64
- Create CHANGELOG.md with full version history

All 64 tests now pass. No production code changes.

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

mcp-servers/gitea/TESTING.md

@@ -28,7 +28,7 @@ source .venv/bin/activate  # Linux/Mac
 
 ### Running All Tests
 
-Run all 42 unit tests:
+Run all 64 unit tests:
 
 ```bash
 pytest tests/ -v
@@ -36,7 +36,7 @@ pytest tests/ -v
 
 Expected output:
 ```
-============================== 42 passed in 0.57s ==============================
+============================== 64 passed ==============================
 ```
 
 ### Running Specific Test Files
@@ -532,7 +532,7 @@ python -m mcp_server.server
 
 After completing all tests, verify:
 
-- ✅ All 42 unit tests pass
+- ✅ All 64 unit tests pass
 - ✅ MCP server starts without errors
 - ✅ Configuration loads correctly
 - ✅ Gitea API client connects successfully
@@ -548,7 +548,7 @@ After completing all tests, verify:
 
 Phase 1 is complete when:
 
-1. **All unit tests pass** (42/42)
+1. **All unit tests pass** (64/64)
 2. **MCP server starts without errors**
 3. **Can list issues from Gitea**
 4. **Can create issues with labels** (in development mode)