Add configurable SMTP service for sending signature reminder emails.
Features:
- Configurable via ACKIFY_MAIL_* environment variables
- Multilingual templates (en/fr) with HTML + text versions
- Template rendering with automatic variable injection
- Graceful degradation when SMTP not configured
- TLS/STARTTLS support with configurable timeout
- MailHog integration for local testing
Add comprehensive internationalization support:
- Browser language detection via Accept-Language header
- Cookie-based language preference persistence (1 year)
- Language switcher with flag emojis (🇫🇷🇬🇧)
- 71 translation keys covering all UI elements
- Context-based translation injection via middleware
Replace Tailwind CDN with production build:
- Tailwind CLI v3.4.16 for CSS compilation
- Minified CSS output (5.9KB from several MB)
- Docker build integration
- Custom color palette configuration
Update all templates with i18n support:
- Main pages: home, sign, signatures, error
- Admin dashboard and document details
- Embed iframe widget (English only for international use)
- Language switcher preserves current page URL
Technical implementation:
- golang.org/x/text for language matching
- Middleware pattern for consistent i18n injection
- Fallback chain: Cookie → Accept-Language → English
- Separate translation files (locales/fr.json, locales/en.json)
- Move templates from webtemplates/templates/ to templates/
- Replace embedded filesystem with filesystem-based template loading
- Add ACKIFY_TEMPLATES_DIR environment variable for custom template paths
- Update Dockerfile to copy templates and set default template directory
- Improve template resolution with fallback paths for development
- Remove webtemplates package and embedded filesystem dependencies
- Update BUILD.md documentation for template configuration
- Rename binary from ackify-ce to ackify for consistency
- Add migrate binary build and deployment
- Add migration service to docker-compose with proper dependency chain
- Ensure migrations run before main service startup
- Update dependencies from migration system integration
Add complete Go application for cryptographic document signature validation with OAuth2 authentication, Ed25519 signatures, and PostgreSQL storage following clean architecture principles.
