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

packages/shared-db/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@shieldsai/shared-db",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "scripts": {
+    "db:generate": "prisma generate",
+    "db:push": "prisma db push",
+    "db:migrate": "prisma migrate deploy",
+    "db:studio": "prisma studio",
+    "db:format": "prisma format"
+  },
+  "dependencies": {
+    "@prisma/client": "^5.14.0",
+    "zod": "^4.3.6"
+  },
+  "devDependencies": {
+    "prisma": "^5.14.0",
+    "typescript": "^5.3.3"
+  }
+}