feat: add network mode with combined HTTP and SSE endpoints

- Add new 'network' transport mode that serves both HTTP and SSE endpoints simultaneously
- HTTP endpoint available on specified port (/mcp)
- SSE endpoint available on port+1 (/sse)
- Maintain backward compatibility with stdio, http, sse modes
- Update documentation and examples for new network mode
- Default to network mode for improved user experience

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

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

config.json

@@ -1,6 +1,6 @@
 {
   "mcpServers": {
-    "gitea": {
+    "gitea-stdio": {
       "command": "gitea-mcp",
       "args": {
         "-t": "stdio",
@@ -11,6 +11,12 @@
         "GITEA_HOST": "https://gitea.com",
         "GITEA_ACCESS_TOKEN": "<your personal access token>"
       }
+    },
+    "gitea-network-http": {
+      "url": "http://localhost:8080/mcp"
+    },
+    "gitea-network-sse": {
+      "url": "http://localhost:8081/sse"
     }
   }
 }