feat(deploy): merge Phase 5a deployment configuration

Complete containerized deployment system with Docker/Podman support.

Key features:
- Multi-stage Dockerfile with Python 3.11-slim base
- Docker Compose configurations for production and development
- Nginx reverse proxy with security headers and rate limiting
- Systemd service units for Docker, Podman, and docker-compose
- Backup/restore scripts with integrity verification
- Podman compatibility (ADR-009)

All tests pass including Podman verification testing.

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

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

deployment/nginx/conf.d/gondulf.conf

@@ -0,0 +1,147 @@
+# Gondulf IndieAuth Server - nginx Configuration
+# TLS termination, reverse proxy, rate limiting, and security headers
+
+# Rate limiting zones
+limit_req_zone $binary_remote_addr zone=gondulf_auth:10m rate=10r/s;
+limit_req_zone $binary_remote_addr zone=gondulf_token:10m rate=20r/s;
+limit_req_zone $binary_remote_addr zone=gondulf_general:10m rate=30r/s;
+
+# Upstream backend
+upstream gondulf_backend {
+    server gondulf:8000;
+    keepalive 32;
+}
+
+# HTTP server - redirect to HTTPS
+server {
+    listen 80;
+    listen [::]:80;
+    server_name auth.example.com;  # CHANGE THIS to your domain
+
+    # Allow Let's Encrypt ACME challenges
+    location /.well-known/acme-challenge/ {
+        root /var/www/certbot;
+    }
+
+    # Redirect all other HTTP traffic to HTTPS
+    location / {
+        return 301 https://$server_name$request_uri;
+    }
+}
+
+# HTTPS server
+server {
+    listen 443 ssl http2;
+    listen [::]:443 ssl http2;
+    server_name auth.example.com;  # CHANGE THIS to your domain
+
+    # SSL/TLS configuration
+    ssl_certificate /etc/nginx/ssl/fullchain.pem;
+    ssl_certificate_key /etc/nginx/ssl/privkey.pem;
+
+    # Modern TLS configuration
+    ssl_protocols TLSv1.2 TLSv1.3;
+    ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
+    ssl_prefer_server_ciphers off;
+
+    # SSL session cache
+    ssl_session_cache shared:SSL:10m;
+    ssl_session_timeout 10m;
+
+    # OCSP stapling
+    ssl_stapling on;
+    ssl_stapling_verify on;
+    resolver 8.8.8.8 8.8.4.4 valid=300s;
+    resolver_timeout 5s;
+
+    # Security headers
+    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
+    add_header X-Frame-Options "DENY" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    # CSP will be set by the application
+
+    # Logging
+    access_log /var/log/nginx/gondulf_access.log combined;
+    error_log /var/log/nginx/gondulf_error.log warn;
+
+    # Client request limits
+    client_max_body_size 1M;
+    client_body_timeout 10s;
+    client_header_timeout 10s;
+
+    # Authorization endpoint - stricter rate limiting
+    location ~ ^/(authorize|auth) {
+        limit_req zone=gondulf_auth burst=20 nodelay;
+        limit_req_status 429;
+
+        proxy_pass http://gondulf_backend;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Forwarded-Host $host;
+        proxy_set_header X-Forwarded-Port $server_port;
+        proxy_set_header Connection "";
+
+        # Proxy timeouts
+        proxy_connect_timeout 10s;
+        proxy_send_timeout 30s;
+        proxy_read_timeout 30s;
+    }
+
+    # Token endpoint - moderate rate limiting
+    location /token {
+        limit_req zone=gondulf_token burst=40 nodelay;
+        limit_req_status 429;
+
+        proxy_pass http://gondulf_backend;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Forwarded-Host $host;
+        proxy_set_header X-Forwarded-Port $server_port;
+        proxy_set_header Connection "";
+
+        proxy_connect_timeout 10s;
+        proxy_send_timeout 30s;
+        proxy_read_timeout 30s;
+    }
+
+    # Health check endpoint - no rate limiting, no logging
+    location /health {
+        access_log off;
+        proxy_pass http://gondulf_backend;
+        proxy_http_version 1.1;
+        proxy_set_header Connection "";
+    }
+
+    # All other endpoints - general rate limiting
+    location / {
+        limit_req zone=gondulf_general burst=60 nodelay;
+        limit_req_status 429;
+
+        proxy_pass http://gondulf_backend;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header X-Forwarded-Host $host;
+        proxy_set_header X-Forwarded-Port $server_port;
+        proxy_set_header Connection "";
+
+        proxy_connect_timeout 10s;
+        proxy_send_timeout 30s;
+        proxy_read_timeout 30s;
+
+        # Buffer settings
+        proxy_buffering on;
+        proxy_buffer_size 4k;
+        proxy_buffers 8 4k;
+    }
+}