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)

config.yaml

@@ -0,0 +1,35 @@
+# Krawl Honeypot Configuration
+
+server:
+  port: 5000
+  delay: 100  # Response delay in milliseconds
+  timezone: null  # e.g., "America/New_York" or null for system default
+
+links:
+  min_length: 5
+  max_length: 15
+  min_per_page: 10
+  max_per_page: 15
+  char_space: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+  max_counter: 10
+
+canary:
+  token_url: null  # Optional canary token URL
+  token_tries: 10
+
+dashboard:
+  # if set to "null" this will Auto-generates random path if not set
+  # can be set to "dashboard" or similar
+  secret_path: dashboard
+
+api:
+  server_url: null
+  server_port: 8080
+  server_path: "/api/v2/users"
+
+database:
+  path: "data/krawl.db"
+  retention_days: 30
+
+behavior:
+  probability_error_codes: 0  # 0-100 percentage