fix: profile creation fallback when hermes_cli unavailable (Docker)

When hermes-agent is not discoverable (common in Docker), create_profile_api()
raised a hard RuntimeError while list and delete already had manual fallbacks.

Changes:
- Add _create_profile_fallback() that bootstraps profile directory structure
  directly (matching upstream hermes_cli.profiles: 8 subdirs + config clone)
- Extract _validate_profile_name() so validation works without hermes_cli
- Add constants _PROFILE_ID_RE, _PROFILE_DIRS, _CLONE_CONFIG_FILES matching
  upstream hermes-agent
- Remove :ro from docker-compose.yml hermes home mount so profiles dir is
  writable inside the container

Closes #44

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -8,8 +8,8 @@ services:
     volumes:
       # Persist session data, settings, and projects across restarts
       - hermes-data:/data
-      # Mount hermes-agent for full agent features (optional)
-      - ${HERMES_HOME:-${HOME}/.hermes}:/root/.hermes:ro
+      # Mount hermes home for agent features and profile management
+      - ${HERMES_HOME:-${HOME}/.hermes}:/root/.hermes
     environment:
       - HERMES_WEBUI_HOST=0.0.0.0
       - HERMES_WEBUI_PORT=8787