FRE-4533: Merge apps/{api,web,mobile} and shared-db into ShieldAI repo

- Copy apps/api (Fastify server with spamshield/voiceprint/darkwatch services)
- Copy apps/web (SolidJS web app)
- Copy apps/mobile (SolidJS mobile app)
- Copy packages/shared-db (Prisma schema/models)
- Add apps/* to pnpm-workspace.yaml

apps/api/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "api",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "build": "tsc",
+    "lint": "eslint src/"
+  },
+  "dependencies": {
+    "@fastify/cors": "^11.2.0",
+    "@fastify/helmet": "^13.0.2",
+    "@shieldsai/shared-analytics": "*",
+    "@shieldsai/shared-auth": "*",
+    "@shieldsai/shared-billing": "*",
+    "@shieldsai/shared-db": "*",
+    "@shieldsai/shared-notifications": "*",
+    "@shieldsai/shared-utils": "*",
+    "fastify": "^4.25.0",
+    "fastify-plugin": "^4.5.0",
+    "ioredis": "^5.3.0"
+  },
+  "devDependencies": {
+    "@types/node": "^25.6.0",
+    "tsx": "^4.7.1",
+    "typescript": "^5.3.3"
+  }
+}