Add GitHub Copilot as a first-class provider

Author: zortos293

apps/server/package.json

@@ -26,6 +26,8 @@
     "@anthropic-ai/claude-agent-sdk": "^0.2.77",
     "@effect/platform-node": "catalog:",
     "@effect/sql-sqlite-bun": "catalog:",
+    "@github/copilot": "1.0.10",
+    "@github/copilot-sdk": "0.2.0",
     "@pierre/diffs": "^1.1.0-beta.16",
     "effect": "catalog:",
     "node-pty": "^1.1.0",