feat(lsp): add Python language server support

- Add pyright-langserver for Python LSP support
- Add environment variable overrides for Python LSP configuration
- Install git in Docker image (required for gopls dependency resolution)
- Optimize Go binary build with -s -w linker flags for smaller image
- Add GOPROXY configuration for faster dependency downloads
- Update Node.js installation method with GPG key verification
- Add entrypoint script to auto-create go.mod in workspace
- Add /app/logs volume for log persistence

backend/config.json

@@ -56,6 +56,14 @@
       "languageId": "java",
       "command": "jdt-language-server-1.57.0-202602111032/jdtls.bat",
       "args": []
+    },
+    {
+      "language": "python",
+      "languageId": "python",
+      "command": "pyright-langserver",
+      "args": [
+        "--stdio"
+      ]
     }
   ]
 }