Add NexusAI: universal MCP service (TTS/STT/image/video/music/web-search)

Monorepo-lite with shared @nexusai/core and @nexusai/mcp-server (stdio).
Provider-agnostic tools with explicit provider selection; NordRouter adapter
(media generate/poll/download, estimate, upload, models) and search via
perplexity/sonar. Local STT via faster-whisper uv sidecar. SQLite journal of
every generation for usage stats and future admin. 10 MCP tools.

NexusAI/packages/mcp-server/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@nexusai/mcp-server",
+  "version": "0.1.0",
+  "description": "NexusAI MCP server (stdio): TTS, STT, image/video/music generation, web search",
+  "main": "dist/index.js",
+  "type": "commonjs",
+  "bin": {
+    "nexusai-mcp": "dist/index.js"
+  },
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "start": "node dist/index.js"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.12.0",
+    "@nexusai/core": "*",
+    "zod": "^3.25.0",
+    "zod-to-json-schema": "^3.25.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.15.0",
+    "typescript": "^5.8.0"
+  }
+}