Migrate configuration from environment variables to YAML file

- Add YAML-based configuration loaded from config.yaml (CONFIG_LOCATION env var)
  - Add PyYAML dependency and install requirements in Dockerfile
  - Replace Config.from_env() with get_config() singleton pattern
  - Remove server_header from config (now randomized from wordlists only)
  - Update docker-compose.yaml to mount config.yaml read-only
  - Update Helm chart: restructure values.yaml, generate config.yaml in ConfigMap
  - Update Kubernetes manifests: ConfigMap now contains config.yaml, deployments mount it
  - Remove Helm secret.yaml (dashboard path now auto-generated in config.yaml)

docker-compose.yaml

@@ -10,23 +10,9 @@ services:
       - "5000:5000"
     volumes:
       - ./wordlists.json:/app/wordlists.json:ro
+      - ./config.yaml:/app/config.yaml:ro
     environment:
-      - PORT=5000
-      - DELAY=100
-      - LINKS_MIN_LENGTH=5
-      - LINKS_MAX_LENGTH=15
-      - LINKS_MIN_PER_PAGE=10
-      - LINKS_MAX_PER_PAGE=15
-      - MAX_COUNTER=10
-      - CANARY_TOKEN_TRIES=10
-      - PROBABILITY_ERROR_CODES=0
-      # - SERVER_HEADER=Apache/2.2.22 (Ubuntu)
-      # Optional: Set your canary token URL
-      # - CANARY_TOKEN_URL=http://canarytokens.com/api/users/YOUR_TOKEN/passwords.txt
-      # Optional: Set custom dashboard path (auto-generated if not set)
-      # - DASHBOARD_SECRET_PATH=/my-secret-dashboard
-      # Optional: Set timezone for logs and dashboard (e.g., America/New_York, Europe/Rome)
-      # - TIMEZONE=UTC
+      - CONFIG_LOCATION=config.yaml
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "python3", "-c", "import requests; requests.get('http://localhost:5000')"]