docs: update env and docker-compose for session-based auth

- Replace JWT config with SESSION_SECRET and SESSION_TTL_HOURS
- Remove AUTHENTIK_JWKS_URL, ISSUER, AUDIENCE (no longer needed)
- Update docker-compose.traefik.yml environment variables

docker-compose.traefik.yml

@@ -77,7 +77,8 @@ services:
       POSTGRES_HOST: postgres
       POSTGRES_PORT: 5432
       REDIS_URL: redis://redis:6379/0
-      JWT_SECRET: ${JWT_SECRET:-change-me-in-production}
+      SESSION_SECRET: ${SESSION_SECRET:-change-me-in-production}
+      SESSION_TTL_HOURS: ${SESSION_TTL_HOURS:-24}
       REPO_BASE_PATH: /data/repos
       API_DOMAIN: ${API_DOMAIN}
       WEB_DOMAIN: ${WEB_DOMAIN}
@@ -89,9 +90,6 @@ services:
       AUTHENTIK_APPLICATION_SLUG: ${AUTHENTIK_APPLICATION_SLUG:-headquarter-web}
       AUTHENTIK_AUTHORIZE_URL: ${AUTHENTIK_AUTHORIZE_URL:-}
       AUTHENTIK_TOKEN_URL: ${AUTHENTIK_TOKEN_URL:-}
-      AUTHENTIK_JWKS_URL: ${AUTHENTIK_JWKS_URL:-}
-      AUTHENTIK_ISSUER: ${AUTHENTIK_ISSUER:-}
-      AUTHENTIK_AUDIENCE: ${AUTHENTIK_AUDIENCE:-headquarter-web}
     volumes:
       - repo_data:/data/repos
       - avatar_uploads:/app/uploads