docs: 统一文档与代码一致性

- 修复所有 confidence → subjective_confidence 残留(03-api, 04-agents, 05-data, 07-development)
- 修复 5 张表 → 6 张表残留(06-deployment)
- 同步 API schema 示例与实际模型一致
- 更新 predictions 表结构文档(新增 status/cutoff/input_hash 字段)

code: 修复 API 异常处理(eval/predict)和 context_builder stats 时间过滤

docs/03-api.md

@@ -87,17 +87,17 @@ Base URL: `http://localhost:8000` · 交互式文档: `/docs`(Swagger)与 `/redo
   "pred_home_goals": 2.1,
   "pred_away_goals": 1.0,
   "pred_1x2": "1",
-  "confidence": 0.68,
+  "subjective_confidence": 0.68,
   "reasoning": "综合 xg 报告的进球期望 2.1-1.0 与 form 报告的三连胜势头……",
   "agent_outputs": [
     {"agent": "h2h", "status": "ok", "data_sufficiency": "medium",
      "analysis": "近 5 次交锋主队 3 胜……", "home_edge": 0.4,
-     "confidence": 0.7, "key_evidence": ["近5次交锋主队3胜", "主场交锋3连胜"],
+     "subjective_confidence": 0.7, "key_evidence": ["近5次交锋主队3胜", "主场交锋3连胜"],
      "exp_home_goals": null, "exp_away_goals": null, "probable_score": null,
      "model": "gpt-4o-mini", "latency_ms": 2100,
      "prompt_tokens": 380, "completion_tokens": 120},
     {"agent": "injuries", "status": "no_data", "data_sufficiency": "none",
-     "analysis": "该维度无数据,跳过分析。", "home_edge": null, "confidence": null,
+     "analysis": "该维度无数据,跳过分析。", "home_edge": null, "subjective_confidence": null,
      "key_evidence": [], "exp_home_goals": null, "exp_away_goals": null,
      "probable_score": null, "model": "", "latency_ms": null,
      "prompt_tokens": null, "completion_tokens": null}
@@ -172,7 +172,7 @@ Base URL: `http://localhost:8000` · 交互式文档: `/docs`(Swagger)与 `/redo
 ```json
 {"summary": [
   {"provider": "openai", "model": "gpt-4o", "total": 12,
-   "accuracy_1x2": 58.3, "avg_score_rmse": 1.21, "avg_confidence": 0.65}
+   "accuracy_1x2": 58.3, "avg_score_rmse": 1.21, "avg_subjective_confidence": 0.65}
 ]}
 ```