feat(phase-6): Complete testing and deployment setup

Testing:
- Add pytest configuration (pytest.ini)
- Add test fixtures (tests/conftest.py)
- Add ContentGenerator tests (13 tests)
- Add ContentScheduler tests (16 tests)
- Add PublisherManager tests (16 tests)
- All 45 tests passing

Production Docker:
- Add docker-compose.prod.yml with healthchecks, resource limits
- Add Dockerfile.prod with multi-stage build, non-root user
- Add nginx.prod.conf with SSL, rate limiting, security headers
- Add .env.prod.example template

Maintenance Scripts:
- Add backup.sh for database and media backups
- Add restore.sh for database restoration
- Add cleanup.sh for log rotation and Docker cleanup
- Add healthcheck.sh with Telegram alerts

Documentation:
- Add DEPLOY.md with complete deployment guide

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.prod.example

@@ -0,0 +1,73 @@
+# ===========================================
+# Production Environment Variables
+# Copy to .env.prod and fill in values
+# ===========================================
+
+# ─────────────────────────────────────────
+# DATABASE
+# ─────────────────────────────────────────
+POSTGRES_USER=social_automation
+POSTGRES_PASSWORD=CHANGE_THIS_STRONG_PASSWORD
+POSTGRES_DB=social_automation
+
+# ─────────────────────────────────────────
+# APPLICATION
+# ─────────────────────────────────────────
+SECRET_KEY=GENERATE_A_SECURE_RANDOM_KEY_HERE
+ENVIRONMENT=production
+
+# ─────────────────────────────────────────
+# BUSINESS INFO
+# ─────────────────────────────────────────
+BUSINESS_NAME="Consultoría AS"
+BUSINESS_LOCATION="Tijuana, México"
+BUSINESS_WEBSITE="https://consultoria-as.com"
+CONTENT_TONE="Profesional pero accesible, técnico cuando es necesario"
+
+# ─────────────────────────────────────────
+# DEEPSEEK API
+# ─────────────────────────────────────────
+DEEPSEEK_API_KEY=your_deepseek_api_key
+DEEPSEEK_BASE_URL=https://api.deepseek.com
+
+# ─────────────────────────────────────────
+# X (TWITTER) API
+# ─────────────────────────────────────────
+X_API_KEY=your_x_api_key
+X_API_SECRET=your_x_api_secret
+X_ACCESS_TOKEN=your_x_access_token
+X_ACCESS_SECRET=your_x_access_secret
+X_BEARER_TOKEN=your_x_bearer_token
+
+# ─────────────────────────────────────────
+# META (FACEBOOK, INSTAGRAM, THREADS)
+# ─────────────────────────────────────────
+META_ACCESS_TOKEN=your_meta_access_token
+META_APP_ID=your_meta_app_id
+META_APP_SECRET=your_meta_app_secret
+
+# Facebook
+FACEBOOK_PAGE_ID=your_facebook_page_id
+
+# Instagram
+INSTAGRAM_ACCOUNT_ID=your_instagram_account_id
+
+# Threads
+THREADS_USER_ID=your_threads_user_id
+
+# ─────────────────────────────────────────
+# IMAGE UPLOAD (ImgBB)
+# ─────────────────────────────────────────
+IMGBB_API_KEY=your_imgbb_api_key
+
+# ─────────────────────────────────────────
+# TELEGRAM NOTIFICATIONS
+# ─────────────────────────────────────────
+TELEGRAM_BOT_TOKEN=your_telegram_bot_token
+TELEGRAM_CHAT_ID=your_telegram_chat_id
+
+# ─────────────────────────────────────────
+# FLOWER (Celery Monitor)
+# ─────────────────────────────────────────
+FLOWER_USER=admin
+FLOWER_PASSWORD=CHANGE_THIS_STRONG_PASSWORD