fix(Phase 3): Evolver force=True bypass flag + 清理未使用 import

- run_evolver(force=True)：管理員手動端點可繞過 feature flag
- 移除 typing.Any 未使用 import
- 移除 _merge_similar 中冗餘的 calculate_jaccard_similarity import

ADR-083 Phase 3 — 2026-04-15 ogt + Claude Sonnet 4.6（亞太）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/playbook_evolver.py

@@ -25,7 +25,6 @@ from __future__ import annotations
 import asyncio
 from dataclasses import dataclass, field
 from datetime import timedelta
-from typing import Any
 
 import structlog
 
@@ -65,10 +64,13 @@ class EvolverReport:
 # Main Entry Point
 # ─────────────────────────────────────────────────────────────────────────────
 
-async def run_evolver() -> EvolverReport:
+async def run_evolver(force: bool = False) -> EvolverReport:
     """
     執行 Evolver Agent 全流程。
 
+    Args:
+        force: True 時跳過 feature flag 檢查（供管理員手動觸發端點使用）
+
     Returns:
         EvolverReport（包含所有操作結果）
 
@@ -77,7 +79,7 @@ async def run_evolver() -> EvolverReport:
     """
     from src.core.feature_flags import aiops_flags
 
-    if not aiops_flags.AIOPS_P3_EVOLVER_ENABLED:
+    if not force and not aiops_flags.AIOPS_P3_EVOLVER_ENABLED:
         logger.debug("evolver_skipped", reason="AIOPS_P3_EVOLVER_ENABLED=False")
         return EvolverReport()
 
@@ -209,7 +211,6 @@ async def _merge_similar(playbooks: list[Playbook], report: EvolverReport) -> No
     合併次數上限 MAX_MERGE_PER_RUN，避免單次操作影響太多。
     """
     from src.services.playbook_service import get_playbook_service
-    from src.utils.similarity import calculate_jaccard_similarity
 
     service = get_playbook_service()
     merged_set: set[str] = set()  # 已合併（或被合併）的 playbook_id