feat(tools): add label and milestone operations

- Create labels.py with gitea_list_labels and gitea_create_label tools
- Integrate milestone tools from milestones.py into server
- Update tools/__init__.py with all tool exports
- Update server.py to handle label and milestone tool calls

Closes #4, Closes #5

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

src/gitea_mcp/server.py

@@ -9,7 +9,14 @@ from mcp.types import Tool, TextContent
 from . import __version__
 from .auth import AuthConfig
 from .client import GiteaClient, GiteaClientError
-from .tools import get_issue_tools, handle_issue_tool, get_label_tools, handle_label_tool
+from .tools import (
+    get_issue_tools,
+    handle_issue_tool,
+    get_label_tools,
+    handle_label_tool,
+    get_milestone_tools,
+    handle_milestone_tool,
+)
 
 
 # Global client instance
@@ -36,11 +43,12 @@ async def serve() -> None:
         """List available MCP tools.
 
         Returns:
-            list: Available tools including issue and label operations.
+            list: Available tools including issue, label, and milestone operations.
         """
-        # Get issue and label tools
+        # Get issue, label, and milestone tools
         tools = get_issue_tools()
         tools.extend(get_label_tools())
+        tools.extend(get_milestone_tools())
 
         # Placeholder for future tools (PR tools, etc.)
         tools.extend([
@@ -115,6 +123,12 @@ async def serve() -> None:
         ):
             return await handle_label_tool(gitea_client, name, arguments)
 
+        # Handle milestone tools
+        if name.startswith("gitea_") and any(
+            name.endswith(suffix) for suffix in ["_milestones", "_milestone"]
+        ):
+            return await handle_milestone_tool(name, arguments, gitea_client)
+
         # Placeholder for other tools
         return [
             TextContent(