refactor: split precheck_core and migrate commands to commands/

- Split 900-line precheck_core.py into 9 focused modules:
  precheck_constants, time_utils, data_utils, state_manager,
  market_data, candidate_scoring, snapshot_builder,
  adaptive_profile, trigger_analyzer
- Remove dead auto_trader command and module
- Migrate 7 root-level command modules into commands/:
  check_api, doctor, external_gate, init_user_state,
  market_probe, paths, rotate_external_gate_log
- Keep thin backward-compatible facades in root package
- Update cli.py MODULE_MAP to route through commands/
- Verified compileall and smoke tests for all key commands

src/coinhunter/paths.py

@@ -1,16 +1,8 @@
-"""Print CoinHunter runtime paths."""
+"""Backward-compatible facade for paths."""
 
 from __future__ import annotations
 
-import json
-
-from .runtime import get_runtime_paths
-
-
-def main() -> int:
-    print(json.dumps(get_runtime_paths().as_dict(), ensure_ascii=False, indent=2))
-    return 0
-
+from .commands.paths import main
 
 if __name__ == "__main__":
     raise SystemExit(main())