Fix port conflict: separate Next.js (3001) from Go API (PORT)

- Next.js admin now runs on internal port 3001
- Go API uses Dokku's PORT environment variable (5000)
- Updated admin proxy default to localhost:3001
- Added /_next/* static asset proxy route

This fixes the "address already in use" error when deploying to Dokku
where both services were trying to bind to port 3000.

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

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

docs/DOKKU_SETUP.md

@@ -10,12 +10,12 @@ This guide provides step-by-step instructions for deploying the Casera Go API to
 4. [Create the App](#create-the-app)
 5. [Configure PostgreSQL](#configure-postgresql)
 6. [Configure Redis](#configure-redis)
-7. [Configure Gorush (Push Notifications)](#configure-gorush-push-notifications)
-8. [Set Environment Variables](#set-environment-variables)
-9. [Configure Storage](#configure-storage)
-10. [Deploy the Application](#deploy-the-application)
-11. [Configure SSL](#configure-ssl)
-12. [Set Up Worker Process](#set-up-worker-process)
+7. [Set Environment Variables](#set-environment-variables)
+8. [Configure Storage](#configure-storage)
+9. [Deploy the Application](#deploy-the-application)
+10. [Configure SSL](#configure-ssl)
+11. [Set Up Worker Process](#set-up-worker-process)
+12. [Push Notifications (Optional)](#push-notifications-optional)
 13. [Maintenance Commands](#maintenance-commands)
 14. [Troubleshooting](#troubleshooting)
 
@@ -198,85 +198,6 @@ dokku redis:info casera-redis
 
 ---
 
-## Configure Gorush (Push Notifications)
-
-Gorush handles push notifications for iOS (APNs) and Android (FCM).
-
-### 1. Create Gorush App
-
-```bash
-dokku apps:create gorush
-```
-
-### 2. Create Certificate Storage Directory
-
-```bash
-# Create directory on server
-mkdir -p /var/lib/dokku/data/storage/gorush/certs
-
-# Set permissions (Dokku container user)
-chown -R 32767:32767 /var/lib/dokku/data/storage/gorush
-```
-
-### 3. Copy APNs Key to Server
-
-From your **local machine**:
-
-```bash
-scp /path/to/AuthKey_XXXXXX.p8 root@your-server:/var/lib/dokku/data/storage/gorush/certs/apns_key.p8
-```
-
-### 4. Mount Certificate Directory
-
-```bash
-dokku storage:mount gorush /var/lib/dokku/data/storage/gorush/certs:/certs:ro
-```
-
-### 5. Deploy Gorush
-
-```bash
-dokku git:from-image gorush appleboy/gorush:latest
-```
-
-### 6. Configure Gorush Environment
-
-```bash
-dokku config:set gorush \
-  GORUSH_CORE_PORT=8080 \
-  GORUSH_IOS_ENABLED=true \
-  GORUSH_IOS_KEY_PATH=/certs/apns_key.p8 \
-  GORUSH_IOS_KEY_ID=XXXXXXXXXX \
-  GORUSH_IOS_TEAM_ID=XXXXXXXXXX \
-  GORUSH_IOS_TOPIC=com.yourcompany.casera \
-  GORUSH_IOS_PRODUCTION=true \
-  GORUSH_ANDROID_ENABLED=true \
-  GORUSH_ANDROID_APIKEY=your-firebase-server-key
-```
-
-### 7. Set Proxy Port
-
-```bash
-dokku proxy:ports-set gorush http:80:8080
-```
-
-### 8. Restart Gorush
-
-```bash
-dokku ps:restart gorush
-```
-
-### 9. Verify Gorush is Running
-
-```bash
-# Check status
-dokku ps:report gorush
-
-# Check logs
-dokku logs gorush
-```
-
----
-
 ## Set Environment Variables
 
 ### 1. Required Variables
@@ -310,14 +231,30 @@ dokku config:set casera-api \
   APPLE_TEAM_ID=V3PF3M6B6U
 ```
 
-### 4. Admin Panel URL
+### 4. Push Notifications (Optional)
+
+```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
+  
+```
+// GORUSH_ANDROID_APIKEY=your-firebase-server-key
+
+### 5. Admin Panel URL
 
 ```bash
 dokku config:set casera-api \
   NEXT_PUBLIC_API_URL=https://api.casera.treytartt.com
 ```
 
-### 5. View All Configuration
+### 6. View All Configuration
 
 ```bash
 dokku config:show casera-api
@@ -343,22 +280,6 @@ chown -R 32767:32767 /var/lib/dokku/data/storage/casera-api
 dokku storage:mount casera-api /var/lib/dokku/data/storage/casera-api/uploads:/app/uploads
 ```
 
-### 3. For Push Notification Certificates
-
-```bash
-# Create certs directory
-mkdir -p /var/lib/dokku/data/storage/casera-api/certs
-
-# Copy your APNs key file
-scp /local/path/to/AuthKey_XXXXXX.p8 root@your-server:/var/lib/dokku/data/storage/casera-api/certs/apns_key.p8
-
-# Mount certs directory
-dokku storage:mount casera-api /var/lib/dokku/data/storage/casera-api/certs:/certs:ro
-
-# Set the path in config
-dokku config:set casera-api APNS_AUTH_KEY_PATH=/certs/apns_key.p8
-```
-
 ---
 
 ## Deploy the Application
@@ -445,6 +366,43 @@ dokku ps:report casera-api
 
 ---
 
+#### 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