feat: implement Gitea MCP Server with full test coverage

Phase 1 implementation complete:
- Complete MCP server with 8 tools (list_issues, get_issue, create_issue, update_issue, add_comment, get_labels, suggest_labels, aggregate_issues)
- Hybrid configuration system (system-level + project-level)
- Branch-aware security model (main/staging/development)
- Mode detection (project vs company/PMO)
- Intelligent label suggestion (44-label taxonomy)
- 42 unit tests (100% passing)
- Comprehensive documentation (README.md, TESTING.md)

Files implemented:
- mcp_server/config.py - Configuration loader
- mcp_server/gitea_client.py - Gitea API client
- mcp_server/server.py - MCP server entry point
- mcp_server/tools/issues.py - Issue operations
- mcp_server/tools/labels.py - Label management
- tests/ - Complete test suite (42 tests)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

mcp-servers/gitea/mcp_server/config.py

@@ -0,0 +1,102 @@
+"""
+Configuration loader for Gitea MCP Server.
+
+Implements hybrid configuration system:
+- System-level: ~/.config/claude/gitea.env (credentials)
+- Project-level: .env (repository specification)
+"""
+from pathlib import Path
+from dotenv import load_dotenv
+import os
+import logging
+from typing import Dict, Optional
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+
+class GiteaConfig:
+    """Hybrid configuration loader with mode detection"""
+
+    def __init__(self):
+        self.api_url: Optional[str] = None
+        self.api_token: Optional[str] = None
+        self.owner: Optional[str] = None
+        self.repo: Optional[str] = None
+        self.mode: str = 'project'
+
+    def load(self) -> Dict[str, Optional[str]]:
+        """
+        Load configuration from system and project levels.
+        Project-level configuration overrides system-level.
+
+        Returns:
+            Dict containing api_url, api_token, owner, repo, mode
+
+        Raises:
+            FileNotFoundError: If system config is missing
+            ValueError: If required configuration is missing
+        """
+        # Load system config
+        system_config = Path.home() / '.config' / 'claude' / 'gitea.env'
+        if system_config.exists():
+            load_dotenv(system_config)
+            logger.info(f"Loaded system configuration from {system_config}")
+        else:
+            raise FileNotFoundError(
+                f"System config not found: {system_config}\n"
+                "Create it with: mkdir -p ~/.config/claude && "
+                "cat > ~/.config/claude/gitea.env"
+            )
+
+        # Load project config (overrides system)
+        project_config = Path.cwd() / '.env'
+        if project_config.exists():
+            load_dotenv(project_config, override=True)
+            logger.info(f"Loaded project configuration from {project_config}")
+
+        # Extract values
+        self.api_url = os.getenv('GITEA_API_URL')
+        self.api_token = os.getenv('GITEA_API_TOKEN')
+        self.owner = os.getenv('GITEA_OWNER')
+        self.repo = os.getenv('GITEA_REPO')  # Optional for PMO
+
+        # Detect mode
+        if self.repo:
+            self.mode = 'project'
+            logger.info(f"Running in project mode: {self.repo}")
+        else:
+            self.mode = 'company'
+            logger.info("Running in company-wide mode (PMO)")
+
+        # Validate required variables
+        self._validate()
+
+        return {
+            'api_url': self.api_url,
+            'api_token': self.api_token,
+            'owner': self.owner,
+            'repo': self.repo,
+            'mode': self.mode
+        }
+
+    def _validate(self) -> None:
+        """
+        Validate that required configuration is present.
+
+        Raises:
+            ValueError: If required configuration is missing
+        """
+        required = {
+            'GITEA_API_URL': self.api_url,
+            'GITEA_API_TOKEN': self.api_token,
+            'GITEA_OWNER': self.owner
+        }
+
+        missing = [key for key, value in required.items() if not value]
+
+        if missing:
+            raise ValueError(
+                f"Missing required configuration: {', '.join(missing)}\n"
+                "Check your ~/.config/claude/gitea.env file"
+            )