Rebrand from Casera/MyCrib to honeyDue

Total rebrand across all Go API source files:
- Go module path: casera-api -> honeydue-api
- All imports updated (130+ files)
- Docker: containers, images, networks renamed
- Email templates: support email, noreply, icon URL
- Domains: casera.app/mycrib.treytartt.com -> honeyDue.treytartt.com
- Bundle IDs: com.tt.casera -> com.tt.honeyDue
- IAP product IDs updated
- Landing page, admin panel, config defaults
- Seeds, CI workflows, Makefile, docs
- Database table names preserved (no migration needed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/SUBSCRIPTION_WEBHOOKS.md

@@ -48,7 +48,7 @@ To enable server-side receipt validation:
 
 1. Go to [App Store Connect > Users and Access > Keys](https://appstoreconnect.apple.com/access/api)
 2. Click **Generate API Key**
-3. Give it a name (e.g., "Casera IAP Server")
+3. Give it a name (e.g., "honeyDue IAP Server")
 4. Select **App Manager** role (minimum required for IAP)
 5. Download the `.p8` file - **you can only download it once!**
 6. Note the **Key ID** and **Issuer ID**
@@ -80,15 +80,15 @@ Google uses Cloud Pub/Sub to deliver subscription notifications. Setup requires
 2. Select your project (or create one)
 3. Navigate to **Pub/Sub** > **Topics**
 4. Click **Create Topic**
-5. Name it (e.g., `casera-subscriptions`)
-6. Note the full topic name: `projects/your-project-id/topics/casera-subscriptions`
+5. Name it (e.g., `honeydue-subscriptions`)
+6. Note the full topic name: `projects/your-project-id/topics/honeydue-subscriptions`
 
 ### 2. Create a Push Subscription
 
 1. In the Pub/Sub Topics list, click on your topic
 2. Click **Create Subscription**
 3. Configure:
-   - **Subscription ID**: `casera-subscription-webhook`
+   - **Subscription ID**: `honeydue-subscription-webhook`
    - **Delivery type**: Push
    - **Endpoint URL**: `https://your-domain.com/api/subscription/webhook/google/`
    - **Acknowledgment deadline**: 60 seconds
@@ -100,7 +100,7 @@ Google uses Cloud Pub/Sub to deliver subscription notifications. Setup requires
 2. Select your app
 3. Navigate to **Monetization** > **Monetization setup**
 4. Under **Real-time developer notifications**:
-   - Enter your topic name: `projects/your-project-id/topics/casera-subscriptions`
+   - Enter your topic name: `projects/your-project-id/topics/honeydue-subscriptions`
 5. Click **Save**
 6. Click **Send test notification** to verify the connection
 
@@ -108,7 +108,7 @@ Google uses Cloud Pub/Sub to deliver subscription notifications. Setup requires
 
 1. Go to [Google Cloud Console > IAM & Admin > Service Accounts](https://console.cloud.google.com/iam-admin/serviceaccounts)
 2. Click **Create Service Account**
-3. Name it (e.g., `casera-iap-validator`)
+3. Name it (e.g., `honeydue-iap-validator`)
 4. Grant roles:
    - `Pub/Sub Subscriber` (for webhook handling)
 5. Click **Done**