Remove Gorush, use direct APNs/FCM, fix worker queries

- Remove Gorush push server dependency (now using direct APNs/FCM)
- Update docker-compose.yml to remove gorush service
- Update config.go to remove GORUSH_URL
- Fix worker queries:
  - Use auth_user instead of user_user table
  - Use completed_at instead of completion_date column
- Add NotificationService to worker handler for actionable notifications
- Add docs/PUSH_NOTIFICATIONS.md with architecture documentation
- Update README.md, DOKKU_SETUP.md, and dev.sh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/DOKKU_SETUP.md

@@ -233,19 +233,17 @@ dokku config:set casera-api \
 
 ### 4. Push Notifications (Optional)
 
+The API uses direct APNs/FCM connections (no external push server needed):
+
 ```bash
 dokku config:set casera-api \
-  GORUSH_CORE_PORT=8080 \
-  GORUSH_IOS_ENABLED=true \
-  GORUSH_IOS_KEY_PATH=/push_certs/AuthKey_R9N3SM2WD5.p8 \
-  GORUSH_IOS_KEY_ID=R9N3SM2WD5 \
-  GORUSH_IOS_TEAM_ID=V3PF3M6B6U \
-  GORUSH_IOS_TOPIC=com.tt.casera.CaseraDev \
-  GORUSH_IOS_PRODUCTION=true \
-  GORUSH_ANDROID_ENABLED=false
-  
+  APNS_AUTH_KEY_PATH=/push_certs/AuthKey_R9N3SM2WD5.p8 \
+  APNS_AUTH_KEY_ID=R9N3SM2WD5 \
+  APNS_TEAM_ID=V3PF3M6B6U \
+  APNS_TOPIC=com.tt.casera.CaseraDev \
+  APNS_PRODUCTION=true \
+  FCM_SERVER_KEY=your-firebase-server-key
 ```
-// GORUSH_ANDROID_APIKEY=your-firebase-server-key
 
 ### 5. Admin Panel URL
 
@@ -387,43 +385,6 @@ dokku logs casera-api -p worker
 
 ---
 
-#### 7. Set Proxy Port
-
-```bash
-dokku proxy:ports-set gorush http:80:8080
-```
-
-#### 8. Restart Gorush
-
-```bash
-dokku ps:restart gorush
-```
-
-#### 9. Configure Casera API to Use Gorush
-
-```bash
-dokku config:set casera-api GORUSH_URL=http://gorush.web:8080
-```
-
-#### 10. Verify Gorush is Running
-
-```bash
-# Check status
-dokku ps:report gorush
-
-# Check logs
-dokku logs gorush
-
-# Test health endpoint (if you have a domain set)
-curl http://gorush.yourdomain.com/api/stat/go
-```
-
-### Option B: Use External Push Service
-
-Configure the app to use an external push notification service instead.
-
----
-
 ## Maintenance Commands
 
 ### View Logs
@@ -597,7 +558,9 @@ df -h
 | `EMAIL_HOST_PASSWORD` | Yes | SMTP password |
 | `APPLE_CLIENT_ID` | No | iOS Bundle ID |
 | `APPLE_TEAM_ID` | No | Apple Developer Team ID |
-| `GORUSH_URL` | No | Push notification server URL |
 | `APNS_AUTH_KEY_PATH` | No | Path to APNs .p8 key |
 | `APNS_AUTH_KEY_ID` | No | APNs Key ID |
 | `APNS_TEAM_ID` | No | APNs Team ID |
+| `APNS_TOPIC` | No | APNs topic (bundle ID) |
+| `APNS_PRODUCTION` | No | Use production APNs (default: false) |
+| `FCM_SERVER_KEY` | No | Firebase Cloud Messaging server key |