feat(p3.2+adr-100): Model Version Tracker + SLO 自治 + KB rot cleaner

Wave 8 P3.2 模型版本追蹤 + ADR-100 SLO 自我治理 + 配套：

P3.2 — Model Version Tracking:
- model_version_probe.py (268 行) — 探測 Ollama / OpenRouter 等 provider 的 model version
- model_version_tracker.py (101 行) — 對齊 PG provider_version_history 表
- migrations/p3_2_provider_version_history.sql + rollback — 25 行 schema
- db/models.py +32 行 — ProviderVersionHistory ORM

ADR-100 — AI 自主化 SLO:
- docs/adr/ADR-100-ai-autonomous-slo.md (167 行) — 飛輪 SLO 設計與閾值
- ops/monitoring/slo-rules.yml (254 行) — Prometheus SLO recording rules + alerts
- ops/monitoring/tests/test_slo_rules.yaml (242 行) — promtool unit tests

整合修改:
- main.py +72 行 — Lifespan 啟動 model_version_probe + KB rot cleaner schedule
- gitea_webhook.py +45 行 — webhook 接收 model 版本變化通知
- ci_auto_repair.py / evidence_snapshot.py / pre_decision_investigator.py — 配合接線

新測試:
- test_kb_rot_cleaner_schedule.py (120 行) — 9 tests pass
- test_slo_rules.yaml — promtool 驗收

Tests: 9 passed (test_kb_rot_cleaner_schedule)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-Authored-By: Multiple Engineers (P3.2 + ADR-100) <noreply@anthropic.com>

apps/api/tests/test_kb_rot_cleaner_schedule.py

@@ -0,0 +1,120 @@
+"""
+P3.1-T3: kb_rot_cleaner 月度排程時機計算測試
+=============================================
+驗證 _run_kb_rot_cleaner_loop 的 next_run 計算邏輯正確：
+- 月初 3 點前 → 當月 1 號 03:00
+- 其他時間 → 下月 1 號 03:00
+- 12 月 → 翌年 1 月 1 號 03:00
+
+2026-04-27 P3.1-T3 by Claude
+"""
+from __future__ import annotations
+
+from datetime import datetime
+
+import pytest
+
+
+# ─────────────────────────────────────────────────────────────────────────────
+# 複製 main.py 中的 next_run 計算邏輯（純函式萃取，方便測試）
+# ─────────────────────────────────────────────────────────────────────────────
+
+def _calc_next_run(now: datetime) -> datetime:
+    """
+    計算下次 kb_rot_cleaner 執行時間（月初 03:00 台北時間）
+
+    同 main.py lifespan 中 _run_kb_rot_cleaner_loop 的邏輯。
+    """
+    if now.day == 1 and now.hour < 3:
+        return now.replace(hour=3, minute=0, second=0, microsecond=0)
+    elif now.month == 12:
+        return now.replace(
+            year=now.year + 1, month=1, day=1,
+            hour=3, minute=0, second=0, microsecond=0,
+        )
+    else:
+        return now.replace(
+            month=now.month + 1, day=1,
+            hour=3, minute=0, second=0, microsecond=0,
+        )
+
+
+# ─────────────────────────────────────────────────────────────────────────────
+# Tests
+# ─────────────────────────────────────────────────────────────────────────────
+
+class TestKbRotCleanerSchedule:
+    """月度排程時機計算測試"""
+
+    def test_day1_before_3am_returns_same_day_3am(self):
+        """月初 02:59 → 同日 03:00"""
+        now = datetime(2026, 5, 1, 2, 59, 0)
+        result = _calc_next_run(now)
+        assert result == datetime(2026, 5, 1, 3, 0, 0)
+
+    def test_day1_exactly_midnight_returns_same_day_3am(self):
+        """月初 00:00 → 同日 03:00"""
+        now = datetime(2026, 5, 1, 0, 0, 0)
+        result = _calc_next_run(now)
+        assert result == datetime(2026, 5, 1, 3, 0, 0)
+
+    def test_day1_after_3am_returns_next_month(self):
+        """月初 03:01 → 下月 1 號 03:00"""
+        now = datetime(2026, 5, 1, 3, 1, 0)
+        result = _calc_next_run(now)
+        assert result == datetime(2026, 6, 1, 3, 0, 0)
+
+    def test_mid_month_returns_next_month(self):
+        """月中 → 下月 1 號 03:00"""
+        now = datetime(2026, 5, 15, 12, 0, 0)
+        result = _calc_next_run(now)
+        assert result == datetime(2026, 6, 1, 3, 0, 0)
+
+    def test_december_rolls_over_to_january(self):
+        """12 月 → 翌年 1 月 1 號 03:00"""
+        now = datetime(2026, 12, 15, 12, 0, 0)
+        result = _calc_next_run(now)
+        assert result == datetime(2027, 1, 1, 3, 0, 0)
+
+    def test_december_day1_before_3am_stays_december(self):
+        """12 月 1 日 02:00 → 同日 03:00（不跨年）"""
+        now = datetime(2026, 12, 1, 2, 0, 0)
+        result = _calc_next_run(now)
+        assert result == datetime(2026, 12, 1, 3, 0, 0)
+
+    def test_sleep_seconds_positive(self):
+        """sleep_sec 必須為正數"""
+        now = datetime(2026, 5, 15, 12, 0, 0)
+        next_run = _calc_next_run(now)
+        sleep_sec = (next_run - now).total_seconds()
+        assert sleep_sec > 0
+
+    def test_next_run_always_at_hour_3(self):
+        """所有情況下 next_run 的 hour 必須是 3"""
+        test_cases = [
+            datetime(2026, 1, 1, 2, 59, 59),
+            datetime(2026, 3, 15, 8, 0, 0),
+            datetime(2026, 12, 31, 23, 59, 59),
+            datetime(2026, 6, 1, 3, 30, 0),
+        ]
+        for now in test_cases:
+            result = _calc_next_run(now)
+            assert result.hour == 3, f"Expected hour=3 for now={now}, got {result}"
+            assert result.minute == 0
+            assert result.second == 0
+            assert result.microsecond == 0
+
+    def test_next_run_always_day1(self):
+        """所有情況下 next_run 的 day 必須是 1"""
+        test_cases = [
+            datetime(2026, 1, 15, 12, 0, 0),
+            datetime(2026, 5, 2, 0, 0, 0),
+            datetime(2026, 12, 20, 6, 0, 0),
+        ]
+        for now in test_cases:
+            result = _calc_next_run(now)
+            assert result.day == 1, f"Expected day=1 for now={now}, got {result}"
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])