refactor: remove legacy assistant compatibility

backend/schemas.py

@@ -9,7 +9,7 @@ from __future__ import annotations
 
 from datetime import UTC, datetime
 import re
-from typing import Annotated, Any, ClassVar, Literal, Union
+from typing import Annotated, Any, Literal, Union
 
 from pydantic import BaseModel, ConfigDict, Field, field_validator, model_validator
 from pydantic.alias_generators import to_camel
@@ -197,8 +197,8 @@ class OpeningMessageConfig(CamelModel):
 
 class StartupConfig(CamelModel):
     execution_mode: Literal["sequential"] = "sequential"
-    opening_mode: PromptOpeningMode | None = None
-    entry_mode: PromptEntryMode | None = None
+    opening_mode: PromptOpeningMode = "interruptible"
+    entry_mode: PromptEntryMode = "wait_user"
     actions: list[StartupAction] = Field(default_factory=list, max_length=5)
     opening_message: OpeningMessageConfig | None = None
 
@@ -207,33 +207,15 @@ class StartupConfig(CamelModel):
         ids = [action.id for action in self.actions]
         if len(ids) != len(set(ids)):
             raise ValueError("启动 Action 的 id 不能重复")
-        legacy_confirmation = (
-            self.opening_mode is None and self.opening_message is not None
-        )
-        if self.opening_mode is None:
-            self.opening_mode = (
-                "confirmation" if legacy_confirmation else "interruptible"
-            )
         if self.opening_mode == "confirmation" and self.opening_message is None:
             raise ValueError("确认后继续必须配置开场确认弹窗")
         if self.opening_mode != "confirmation":
             self.opening_message = None
-        if self.entry_mode is None:
-            # Preserve the behavior introduced before entryMode became an
-            # explicit setting. Newly saved clients always send the field.
-            self.entry_mode = (
-                "generate" if legacy_confirmation else "wait_user"
-            )
         return self
 
 
 # ---------- 助手(单表 STI:瘦类型真列 + workflow 图 JSON 列) ----------
 class AssistantUpsert(CamelModel):
-    # AssistantOut inherits this DTO for a stable public shape, but persisted
-    # historical rows must remain readable. Only request models enforce
-    # runtime combinations that the current editor/runtime can create.
-    enforce_request_constraints: ClassVar[bool] = True
-
     name: str
     type: AssistantType = "prompt"
     runtime_mode: RuntimeMode = "pipeline"
@@ -299,23 +281,20 @@ class AssistantUpsert(CamelModel):
             # bindings remain a Prompt-only public API.
             self.tool_bindings = []
             self.built_in_tools = BuiltInTools()
-        if self.enforce_request_constraints:
-            if self.runtime_mode == "realtime" and (
-                self.startup.actions
-                or self.startup.opening_message is not None
-                or self.startup.opening_mode != "interruptible"
-                or self.startup.entry_mode != "wait_user"
-            ):
-                raise ValueError("Prompt Realtime 模式暂不支持启动阶段")
-        # 外部托管大脑只能 cascade,拦住不兼容的 realtime
+        if self.runtime_mode == "realtime" and (
+            self.startup.actions
+            or self.startup.opening_message is not None
+            or self.startup.opening_mode != "interruptible"
+            or self.startup.entry_mode != "wait_user"
+        ):
+            raise ValueError("Prompt Realtime 模式暂不支持启动阶段")
+        # 外部托管大脑只能使用 Pipeline，拦住不支持的 Realtime。
         if self.runtime_mode == "realtime" and self.type not in REALTIME_CAPABLE_TYPES:
             raise ValueError(f"类型 {self.type} 不支持 realtime 运行模式")
         return self
 
 
 class AssistantOut(AssistantUpsert):
-    enforce_request_constraints: ClassVar[bool] = False
-
     id: str
     updated_at: str | None = None