Refactor assistant configuration and database seeding

- Update Makefile to include new database seed commands for assistants and credentials.
- Refactor assistant model to use explicit fields instead of a config dictionary, improving data integrity and clarity.
- Implement new seeding SQL script for assistants, ensuring dependencies on credentials are respected.
- Modify backend routes and frontend components to accommodate the new assistant structure, including direct field access for prompt, API URL, and keys.
- Enhance the AssistantPage component to handle the new data structure and streamline the save process for different assistant types.

backend/schemas.py

@@ -31,43 +31,17 @@ class CamelModel(BaseModel):
     )
 
 
-# ---------- 各类型的 config 形态(JSON 内嵌,按 type 校验) ----------
-class PromptConfig(CamelModel):
-    prompt: str = ""
-    realtime_model: str = ""
-
-
-class WorkflowConfig(CamelModel):
-    graph: dict[str, Any] = {}  # {nodes, edges, viewport};节点 data 可带 *CredentialId 覆盖
-
-
-class DifyConfig(CamelModel):
-    api_url: str = ""
-    api_key: str = ""  # 写时:占位符/空 → 保留旧
-
-
-class FastgptConfig(CamelModel):
-    app_id: str = ""
-    api_url: str = ""
-    api_key: str = ""
-
-
-class OpencodeConfig(CamelModel):
-    prompt: str = ""
-    api_url: str = ""
-    api_key: str = ""
-
-
-CONFIG_BY_TYPE: dict[str, type[CamelModel]] = {
-    "prompt": PromptConfig,
-    "workflow": WorkflowConfig,
-    "dify": DifyConfig,
-    "fastgpt": FastgptConfig,
-    "opencode": OpencodeConfig,
+# 各 type 允许的瘦字段(其余字段写入时清零,防止跨类型脏数据)
+ALLOWED_FIELDS: dict[str, set[str]] = {
+    "prompt": {"prompt"},
+    "workflow": {"graph"},
+    "dify": {"api_url", "api_key"},
+    "fastgpt": {"app_id", "api_url", "api_key"},
+    "opencode": {"prompt", "api_url", "api_key"},
 }
 
 
-# ---------- 助手(单表,无版本化;type 可变) ----------
+# ---------- 助手(单表 STI:瘦类型真列 + workflow 图 JSON 列) ----------
 class AssistantUpsert(CamelModel):
     name: str
     type: AssistantType = "prompt"
@@ -82,14 +56,22 @@ class AssistantUpsert(CamelModel):
     realtime_credential_id: str | None = None
     knowledge_base_id: str | None = None
 
-    # 类型专属字段;校验后归一为 camelCase 存库
-    config: dict[str, Any] = {}
+    # 瘦类型专属(真列);按 type 取用,无关字段写入时清零
+    prompt: str = ""
+    api_url: str = ""
+    api_key: str = ""  # 写时:占位符/空 → 保留旧(哨兵)
+    app_id: str = ""
+    # workflow 专属:图
+    graph: dict[str, Any] = {}
 
     @model_validator(mode="after")
-    def _normalize_config(self):
-        model = CONFIG_BY_TYPE[self.type]
-        # 按当前 type 校验并裁掉无关字段,统一回 camelCase 落库
-        self.config = model.model_validate(self.config).model_dump(by_alias=True)
+    def _strip_irrelevant_fields(self):
+        allowed = ALLOWED_FIELDS[self.type]
+        for field in ("prompt", "api_url", "api_key", "app_id"):
+            if field not in allowed:
+                setattr(self, field, "")
+        if "graph" not in allowed:
+            self.graph = {}
         return self