Add comprehensive API documentation to Cloudron setup instructions

- Added detailed API endpoint information in SETUP-INSTRUCTIONS.md
- Documented API usage with Ente CLI
- Enhanced routing configuration for auth/cast/accounts apps
- Updated to version 0.1.64

Caddyfile.simple

@@ -0,0 +1,21 @@
+{
+    admin off
+    auto_https off
+}
+
+:3080 {
+    log {
+        output stdout
+        level DEBUG
+    }
+
+    # Simple health check that always works
+    handle /health {
+        respond "{\"status\": \"OK\"}" 200
+    }
+
+    # Catch-all for debugging
+    handle {
+        respond "Caddy is running on port 3080" 200
+    }
+}