feat: complete M1-M3 infrastructure — OSS client, native execution chain, rule lifecycle API, system docs

- M1: unified OSS client (upload/download/presign) + path utils + config
- M2: rule service with validate/create/publish/rollback + binding CRUD endpoints
- M3: native AuditCtx runner, file/rule resolvers, storage adapter with full persistence
- docs: SYSTEM_OVERVIEW.md as comprehensive architecture reference
- fix: double finalize — terminal state now written once by finalize_run

fastapi_modules/fastapi_leaudit/leaudit_bridge/pipeline.py

@@ -23,7 +23,7 @@ from leaudit.llm.base import BaseLLMClient
 from leaudit.ocr.base import BaseOCRClient
 from leaudit.ocr.models import OcrResult
 
-from leaudit_bridge.storage_adapter import StorageAdapter
+from fastapi_modules.fastapi_leaudit.leaudit_bridge.storage_adapter import StorageAdapter
 
 log = logging.getLogger(__name__)
 
@@ -229,7 +229,7 @@ class LauditPipeline:
         self, document_id: int, ocr_result: OcrResult,
     ) -> None:
         """Extract case number from OCR and write to database."""
-        from leaudit_bridge.case_number_extractor import (
+        from fastapi_modules.fastapi_leaudit.leaudit_bridge.case_number_extractor import (
             extract_case_number_with_llm,
         )