feat: add prompt opening behavior modes

backend/services/brains/prompt_brain.py

@@ -81,7 +81,7 @@ class PromptBrain(BaseBrain):
     async def greeting(self, cfg: AssistantConfig) -> str:
         # The built-in opening Message owns the greeting so speech and the
         # client dialog can start as one atomic stage.
-        if self._opening_message() is not None:
+        if self._opening_mode() == "confirmation":
             return ""
         return self._render_greeting(cfg)
 
@@ -155,8 +155,19 @@ class PromptBrain(BaseBrain):
 
     async def on_connected(self, *, greeting_pending: bool = False) -> None:
         self._greeting_pending = greeting_pending
+        should_block_input = (
+            self._has_opening_stage()
+            or (
+                greeting_pending
+                and self._opening_mode() == "playback"
+            )
+            or (
+                not greeting_pending
+                and self._entry_mode() == "generate"
+            )
+        )
         if (
-            (self._has_opening_stage() or self._entry_mode() == "generate")
+            should_block_input
             and self._runtime is not None
             and self._runtime.set_input_enabled is not None
         ):
@@ -168,6 +179,16 @@ class PromptBrain(BaseBrain):
         self._greeting_pending = False
         await self._enter_prompt_if_ready()
 
+    async def on_interruption_processed(self) -> None:
+        if (
+            self._greeting_pending
+            and self._opening_mode() == "interruptible"
+        ):
+            # The user's input now owns the first Agent turn. Do not also queue
+            # an empty-context entry reply when the interrupted greeting stops.
+            self._entry_dispatched = True
+            logger.debug("Prompt 可打断开场白已被用户输入接管")
+
     async def on_client_ready(self) -> None:
         if self._output is not None:
             await self._output.mark_client_ready()
@@ -180,7 +201,11 @@ class PromptBrain(BaseBrain):
         runtime = self._runtime
         if runtime is None:
             raise RuntimeError("PromptBrain 尚未初始化")
-        opening_message = self._opening_message()
+        opening_message = (
+            self._opening_message()
+            if self._opening_mode() == "confirmation"
+            else None
+        )
         opening_actions = self._startup_actions("opening")
         speech = (
             self._render_greeting(self._cfg).strip()
@@ -238,6 +263,19 @@ class PromptBrain(BaseBrain):
         value = startup.get("opening_message", startup.get("openingMessage"))
         return value if isinstance(value, dict) else None
 
+    def _opening_mode(self) -> str:
+        startup = self._cfg.startup if isinstance(self._cfg.startup, dict) else {}
+        value = str(startup.get("opening_mode", startup.get("openingMode")) or "")
+        if value in {"interruptible", "playback", "confirmation"}:
+            return value
+        # Before openingMode existed, an opening message meant confirmation;
+        # ordinary Prompt greetings were interruptible.
+        return (
+            "confirmation"
+            if self._opening_message() is not None
+            else "interruptible"
+        )
+
     def _entry_mode(self) -> str:
         startup = self._cfg.startup if isinstance(self._cfg.startup, dict) else {}
         value = str(startup.get("entry_mode", startup.get("entryMode")) or "")
@@ -245,7 +283,7 @@ class PromptBrain(BaseBrain):
             return value
         # Raw runtime configs saved before entryMode existed generated a first
         # reply after their opening confirmation. Keep that legacy behavior.
-        return "generate" if self._opening_message() is not None else "wait_user"
+        return "generate" if self._opening_mode() == "confirmation" else "wait_user"
 
     async def _enter_prompt_if_ready(self) -> None:
         if (
@@ -269,7 +307,7 @@ class PromptBrain(BaseBrain):
         self._opening_input_blocked = False
 
     def _has_opening_stage(self) -> bool:
-        return self._opening_message() is not None or bool(
+        return self._opening_mode() == "confirmation" or bool(
             self._startup_actions("opening")
         )
 
@@ -322,12 +360,6 @@ class PromptBrain(BaseBrain):
                 ).strip(),
             ),
             completion_policy=MESSAGE_CONFIRMATION,
-            skip_speech_on_confirmation=bool(
-                config.get(
-                    "skip_speech_on_confirm",
-                    config.get("skipSpeechOnConfirm", True),
-                )
-            ),
         )
 
     async def _publish_opening_outcome(