fix: replace all manacore.app URLs with mana.how

The production domain is mana.how, not manacore.app. Updated all
references across shared-branding APP_URLS, app configs, landing pages,
docs, help content, calendar iCal UIDs, and deploy scripts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cicd/DEPLOYMENT.md

@@ -445,8 +445,8 @@ curl -s http://localhost:3002/api/v1/health | jq
 
 ```bash
 # Health check endpoints
-curl -s https://staging-api-chat.manacore.app/api/v1/health | jq
-curl -s https://staging-api-zitare.manacore.app/api/v1/health | jq
+curl -s https://staging-api-chat.mana.how/api/v1/health | jq
+curl -s https://staging-api-zitare.mana.how/api/v1/health | jq
 ```
 
 ---

cicd/SETUP.md

@@ -505,7 +505,7 @@ cp docker/templates/Dockerfile.astro apps/bauntown/Dockerfile
 
 1. Add a new "Resource" → "Service"
 2. For each web app/landing:
-   - Set domain (e.g., `chat.manacore.app`)
+   - Set domain (e.g., `chat.mana.how`)
    - Enable "Generate SSL"
    - Set Docker image: `ghcr.io/wuesteon/chat-web:latest`
    - Configure environment variables

cicd/TODO.md

@@ -231,8 +231,8 @@
 ### 3.3 Configure Reverse Proxy (Traefik/Nginx)
 
 - [ ] Plan domain structure:
-  - `chat.manacore.app` → Chat web app
-  - `api-chat.manacore.app` → Chat backend
+  - `chat.mana.how` → Chat web app
+  - `api-chat.mana.how` → Chat backend
   - `maerchenzauber.com` → Landing page
   - `app.maerchenzauber.com` → Web app
   - etc.