Update requirement files with new feature templates and fix backend API error message, along with mobile project config updates and documentation improvements

03_source/mobile.trunk.1/firebase.json

@@ -0,0 +1,31 @@
+{
+  "hosting": {
+    "public": "build",
+    "rewrites": [
+      {
+        "source": "**",
+        "destination": "/index.html"
+      }
+    ],
+    "headers": [
+      {
+        "source": "**/static/**",
+        "headers": [
+          {
+            "key": "Cache-Control",
+            "value": "max-age=31536000"
+          }
+        ]
+      },
+      {
+        "source": "**/*.@(jpg|jpeg|gif|png|svg)",
+        "headers": [
+          {
+            "key": "Cache-Control",
+            "value": "max-age=31536000"
+          }
+        ]
+      }
+    ]
+  }
+}