Add CUD operations to homelab-mcp server

Add upsert_context, update_context, and delete_context tools to
complete CRUD functionality. Upserts use deterministic IDs based on
source+section+host for idempotency. Updates support metadata-only
patches or full re-embedding when text changes.

package.json

@@ -0,0 +1,22 @@
+{
+  "name": "homelab-mcp",
+  "version": "1.0.0",
+  "description": "MCP server for homelab context search via Qdrant",
+  "type": "module",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/index.js",
+    "dev": "tsx src/index.ts"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.12.1",
+    "@qdrant/js-client-rest": "^1.13.0",
+    "zod": "^3.24.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "tsx": "^4.19.0",
+    "typescript": "^5.7.0"
+  }
+}