refactor: update environment configuration and documentation

- Modified `.env.example` to reflect new API URL structure and added CDN configuration for external storage.
- Updated `.gitignore` to include deployment secrets and certificate files, ensuring sensitive information is not committed.
- Revised `BACKEND_INTEGRATION.md` to clarify authentication methods, replacing Cognito references with Nostr NIP-98.
- Deleted outdated documentation files (`CONTENT-INTEGRATION-COMPLETE.md`, `CURSOR-MCP-SETUP.md`, `FINAL-STATUS.md`, `FIXES-APPLIED.md`, `INDEEHHUB-INTEGRATION.md`, `PROJECT-COMPLETE.md`, `PROJECT-SUMMARY.md`) to streamline project documentation.

These changes enhance the clarity of the environment setup and improve the overall documentation structure for better developer onboarding.

DEPLOYMENT.md

@@ -1,32 +1,27 @@
-# IndeedHub - Portainer Deployment Guide
+# IndeeHub Deployment
 
-## Quick Deploy with Portainer Stacks
+## Full Stack (Recommended)
 
-### Method 1: Using Portainer Stacks (Recommended)
+The app requires the full stack: frontend (nginx), backend API, PostgreSQL, Redis, MinIO, FFmpeg worker, Nostr relay.
 
-1. **Log into Portainer**
-2. **Navigate to Stacks**
-3. **Click "Add Stack"**
-4. **Choose "Git Repository"** or **"Upload"** the `docker-compose.yml`
-5. **Configure:**
-   - Name: `indeedhub-prototype`
-   - Repository URL: (your git repo)
-   - Compose path: `docker-compose.yml`
-6. **Deploy**
-
-### Method 2: Using Docker Compose Directly
+### Docker Compose
 
 ```bash
-# Build and run
-docker-compose up -d --build
+# Copy environment template and fill in secrets
+cp .env.portainer.example .env.portainer
+# Edit .env.portainer with your values
 
-# View logs
-docker-compose logs -f
-
-# Stop
-docker-compose down
+# Deploy
+docker compose up -d --build
 ```
 
+### Portainer
+
+1. Create a new Stack
+2. Load variables from `.env.portainer` (use `.env.portainer.example` as template)
+3. Use `docker-compose.yml` from the repo
+4. Deploy
+
 ## Access
 
 - **Application URL**: `http://your-server:7777`