feat: standardize environment variable names with ACKIFY_ prefix

- Renamed all environment variables to use consistent ACKIFY_ prefix
- Updated configuration files, Docker compose, and build documentation
- Modified database connection variables and OAuth configuration
- Updated crypto key environment variable reference
- Ensured consistency across all configuration files

.env.example

@@ -1,43 +1,43 @@
-# Application Configuration
-APP_NAME=ackify-ce
-APP_DNS=your-domain.com
-APP_BASE_URL=https://your-domain.com
-APP_ORGANISATION="Your Organization Name"
-
 # Database Configuration
 POSTGRES_USER=ackifyr
 POSTGRES_PASSWORD=your_secure_password
 POSTGRES_DB=ackify
-DB_DSN=postgres://user:pass@db:5432/ack?sslmode=disable
+
+# Application Configuration
+APP_NAME=ackify
+APP_DNS=sign.your-domain.com
+ACKIFY_BASE_URL=https://sign.your-domain.com
+ACKIFY_ORGANISATION="Your Organization Name"
+ACKIFY_DB_DSN="postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@ackify-db:5432/${POSTGRES_DB}?sslmode=disable"
 
 # OAuth2 Configuration - Generic Provider
-OAUTH_CLIENT_ID=your_oauth_client_id
-OAUTH_CLIENT_SECRET=your_oauth_client_secret
-OAUTH_ALLOWED_DOMAIN=your-organization.com
+ACKIFY_OAUTH_CLIENT_ID=your_oauth_client_id
+ACKIFY_OAUTH_CLIENT_SECRET=your_oauth_client_secret
+ACKIFY_OAUTH_ALLOWED_DOMAIN=your-organization.com
 
 # OAuth2 Provider Configuration
-# Use OAUTH_PROVIDER to configure popular providers automatically:
+# Use ACKIFY_OAUTH_PROVIDER to configure popular providers automatically:
 # - "google" for Google OAuth2
-# - "github" for GitHub OAuth2  
-# - "gitlab" for GitLab OAuth2 (set OAUTH_GITLAB_URL if self-hosted)
+# - "github" for GitHub OAuth2
+# - "gitlab" for GitLab OAuth2 (set ACKIFY_OAUTH_GITLAB_URL if self-hosted)
 # - Leave empty for custom provider (requires manual URL configuration)
-OAUTH_PROVIDER=google
+ACKIFY_OAUTH_PROVIDER=google
 
-# Custom OAuth2 Provider URLs (only needed if OAUTH_PROVIDER is empty)
-# OAUTH_AUTH_URL=https://your-provider.com/oauth/authorize
-# OAUTH_TOKEN_URL=https://your-provider.com/oauth/token
-# OAUTH_USERINFO_URL=https://your-provider.com/api/user
-# OAUTH_SCOPES=openid,email
+# Custom OAuth2 Provider URLs (only needed if ACKIFY_OAUTH_PROVIDER is empty)
+# ACKIFY_OAUTH_AUTH_URL=https://your-provider.com/oauth/authorize
+# ACKIFY_OAUTH_TOKEN_URL=https://your-provider.com/oauth/token
+# ACKIFY_OAUTH_USERINFO_URL=https://your-provider.com/api/user
+# ACKIFY_OAUTH_SCOPES=openid,email
 
 # GitLab specific (if using gitlab as provider and self-hosted)
-# OAUTH_GITLAB_URL=https://gitlab.your-company.com
+# ACKIFY_OAUTH_GITLAB_URL=https://gitlab.your-company.com
 
 # Security Configuration
-OAUTH_COOKIE_SECRET=your_base64_encoded_secret_key
-ED25519_PRIVATE_KEY_B64=your_base64_encoded_ed25519_private_key
+ACKIFY_OAUTH_COOKIE_SECRET=your_base64_encoded_secret_key
+ACKIFY_ED25519_PRIVATE_KEY=your_base64_encoded_ed25519_private_key
 
 # Server Configuration
-LISTEN_ADDR=:8080
+ACKIFY_LISTEN_ADDR=:8080
 
 # Template Configuration
 # ACKIFY_TEMPLATES_DIR=/custom/path/to/templates