Complete Firebase setup with Data Connect and security rules

- Initialize Firebase Data Connect
- Deploy Firestore security rules for SMTP config
- Update firebase.json with Firestore configuration
- Add generated Data Connect SDKs

firebase.json

@@ -0,0 +1,13 @@
+{
+  "firestore": {
+    "rules": "firestore.rules"
+  },
+  "emulators": {
+    "dataconnect": {
+      "dataDir": "dataconnect/.dataconnect/pgliteData"
+    }
+  },
+  "dataconnect": {
+    "source": "dataconnect"
+  }
+}