feat(mcp-chat): added shared libraires and extension points

workspaces/mcp-chat/.changeset/sixty-sides-yell.md

@@ -0,0 +1,8 @@
+---
+'@backstage-community/plugin-mcp-chat-backend': minor
+'@backstage-community/plugin-mcp-chat-common': minor
+'@backstage-community/plugin-mcp-chat-node': minor
+'@backstage-community/plugin-mcp-chat': minor
+---
+
+introduce shared libraries and extension points for future isolation of llm providers in dedicated backend modules

workspaces/mcp-chat/plugins/mcp-chat-backend/config.d.ts

@@ -25,9 +25,8 @@ export interface Config {
       /**
        * Unique identifier for the provider
        * @visibility backend
-       * @enum { 'openai' | 'claude' | 'gemini' | 'ollama' }
        */
-      id: 'openai' | 'claude' | 'gemini' | 'ollama';
+      id: string;
       /**
        * API token for the provider
        * @visibility secret
@@ -43,6 +42,11 @@ export interface Config {
        * @visibility backend
        */
       baseUrl?: string;
+      /**
+       * Provider-specific authentication parameters (IAM, session tokens, etc.)
+       * @visibility secret
+       */
+      auth?: { [key: string]: string };
     }>;
     /**
      * MCP (Model Context Protocol) servers configuration

workspaces/mcp-chat/plugins/mcp-chat-backend/dev/index.ts

@@ -41,5 +41,4 @@ backend.add(
 );
 
 backend.add(import('../src'));
-
 backend.start();

workspaces/mcp-chat/plugins/mcp-chat-backend/package.json

@@ -28,6 +28,8 @@
     "postpack": "backstage-cli package postpack"
   },
   "dependencies": {
+    "@backstage-community/plugin-mcp-chat-common": "workspace:^",
+    "@backstage-community/plugin-mcp-chat-node": "workspace:^",
     "@backstage/backend-defaults": "^0.16.0",
     "@backstage/backend-plugin-api": "^1.8.0",
     "@backstage/config": "^1.3.6",
@@ -42,8 +44,8 @@
     "uuid": "^11.0.0"
   },
   "devDependencies": {
-    "@backstage/backend-test-utils": "^1.11.1",
-    "@backstage/cli": "^0.36.0",
+    "@backstage/backend-test-utils": "^1.6.0",
+    "@backstage/cli": "^0.33.0",
     "@types/express": "^4.17.6",
     "@types/supertest": "^7.0.0",
     "@types/uuid": "^11.0.0",