feat: add MCP server mode with --mcp flag for IDE integration

Add stdio-based MCP server support to OmniRoute CLI, enabling AI agents
in VS Code, Cursor, Claude Desktop, and Copilot to interact with
OmniRoute tools (health, combos, quota, routing). Update help text,
gitignore vscode-extension subproject, and include MCP/A2A strategy report.

Author: diegosouzapw

.gitignore

@@ -113,3 +113,6 @@ electron/package-lock.json
 electron/dist-electron/
 electron/node_modules/
 icon.iconset/
+
+# VS Code Extension (independent Git repo)
+vscode-extension/

bin/omniroute.mjs

@@ -7,6 +7,7 @@
  *   omniroute              Start the server (default port 20128)
  *   omniroute --port 3000  Start on custom port
  *   omniroute --no-open    Start without opening browser
+ *   omniroute --mcp        Start MCP server (stdio transport for IDEs)
  *   omniroute --help       Show help
  *   omniroute --version    Show version
  */
@@ -86,9 +87,17 @@ if (args.includes("--help") || args.includes("-h")) {
     omniroute                 Start the server
     omniroute --port <port>   Use custom API port (default: 20128)
     omniroute --no-open       Don't open browser automatically
+    omniroute --mcp           Start MCP server (stdio transport for IDEs)
     omniroute --help          Show this help
     omniroute --version       Show version
 
+  \x1b[1mMCP Integration:\x1b[0m
+    The --mcp flag starts an MCP server over stdio, exposing OmniRoute
+    tools for AI agents in VS Code, Cursor, Claude Desktop, and Copilot.
+
+    Available tools: omniroute_get_health, omniroute_list_combos,
+    omniroute_check_quota, omniroute_route_request, and more.
+
   \x1b[1mConfig:\x1b[0m
     Loads .env from: ~/.omniroute/.env or ./.env
     Memory limit: OMNIROUTE_MEMORY_MB (default: 512)
@@ -116,6 +125,19 @@ if (args.includes("--version") || args.includes("-v")) {
   process.exit(0);
 }
 
+// ── MCP Server Mode ───────────────────────────────────────
+if (args.includes("--mcp")) {
+  try {
+    const { startMcpStdio } = await import(join(ROOT, "open-sse", "mcp-server", "server.ts"));
+    await startMcpStdio();
+  } catch (err) {
+    console.error("\x1b[31m✖ Failed to start MCP server:\x1b[0m", err.message || err);
+    process.exit(1);
+  }
+  // MCP server runs indefinitely via stdio — don't fall through to Next.js server
+  await new Promise(() => {}); // Keep process alive
+}
+
 function parsePort(value, fallback) {
   const parsed = parseInt(String(value), 10);
   return Number.isFinite(parsed) && parsed > 0 && parsed <= 65535 ? parsed : fallback;