feat: add prompt startup actions and shared vision config

backend/schemas.py

@@ -92,6 +92,26 @@ ALLOWED_FIELDS: dict[str, set[str]] = {
 }
 
 
+class StartupAction(CamelModel):
+    id: str = Field(min_length=1, max_length=64, pattern=r"^[A-Za-z][A-Za-z0-9_-]*$")
+    phase: Literal["preflight", "opening"] = "opening"
+    tool_id: str = Field(min_length=1, max_length=40)
+    arguments: dict[str, Any] = Field(default_factory=dict)
+    required: bool = True
+
+
+class StartupConfig(CamelModel):
+    execution_mode: Literal["sequential"] = "sequential"
+    actions: list[StartupAction] = Field(default_factory=list, max_length=5)
+
+    @model_validator(mode="after")
+    def validate_unique_action_ids(self):
+        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")
+        return self
+
+
 # ---------- 助手(单表 STI:瘦类型真列 + workflow 图 JSON 列) ----------
 class AssistantUpsert(CamelModel):
     name: str
@@ -100,6 +120,7 @@ class AssistantUpsert(CamelModel):
     greeting: str = ""
     enable_interrupt: bool = True
     turn_config: TurnConfig = Field(default_factory=TurnConfig)
+    startup: StartupConfig = Field(default_factory=StartupConfig)
     vision_enabled: bool = False
     vision_model_resource_id: str | None = None
 
@@ -145,6 +166,10 @@ class AssistantUpsert(CamelModel):
         if self.type not in {"prompt", "workflow"}:
             self.tool_ids = []
             self.dynamic_variable_definitions = {}
+        if self.type != "prompt":
+            self.startup = StartupConfig()
+        if self.runtime_mode == "realtime" and self.startup.actions:
+            raise ValueError("Prompt Realtime 模式暂不支持启动 Action")
         # 外部托管大脑只能 cascade,拦住不兼容的 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")