fix: 数据源审查小修（from_config 类型守卫/PROMPTS_KEYS 消重/契约措辞）

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

tests/test_db_tenant_source.py

@@ -20,7 +20,7 @@ import pytest
 from sqlalchemy import text
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.engine.services.ai_service import PromptProvider
+from app.engine.services.ai_service import PROMPTS_KEYS, PromptProvider
 from app.platform.db import (
     Site,
     SiteDomain,
@@ -36,8 +36,6 @@ REPO_ROOT = Path(__file__).resolve().parents[1]
 SEED_DIR = REPO_ROOT / "seed_profiles"
 JC_DOMAIN = "db.jc.example.com"      # DB 源测试专属域名(不与文件源种子撞)
 
-_PROMPTS_KEYS = ("system", "company_facts", "extractor", "evaluator")
-
 
 def _jiancai_snapshot(prefix="ai-kefu-jc"):
     """版本 config_json 构造助手:seed jiancai 的 config 组 + wall.json +
@@ -51,7 +49,7 @@ def _jiancai_snapshot(prefix="ai-kefu-jc"):
         (SEED_DIR / "jiancai" / "wall.json").read_text(encoding="utf-8"))
     snapshot["prompts"] = {
         name: (prompts_dir / f"{name}.md").read_text(encoding="utf-8")
-        for name in _PROMPTS_KEYS
+        for name in PROMPTS_KEYS
     }
     return snapshot
 

tests/test_prompt_provider.py

@@ -153,6 +153,14 @@ def test_from_config_non_string_key_raises():
              "extractor": "e", "evaluator": "v"})
 
 
+def test_from_config_non_dict_raises():
+    # 入口类型守卫: Task 6 的 PUT prompts 会把请求体直传这里——字符串/
+    # 列表进来必须是 ValueError,不能让 .get 的 AttributeError 漏成 500
+    for bad in ("system=...", ["system", "company_facts"], 42, None):
+        with pytest.raises(ValueError, match="dict"):
+            PromptProvider.from_config(bad)
+
+
 def test_from_config_equals_from_dir():
     d = JC_PROMPTS
     cfg = {name: (d / f"{name}.md").read_text(encoding="utf-8")