feat: 完成后端处理链路、优化部分提示词

app/actions/plan.py

@@ -8,6 +8,7 @@ from app.schemas.action_validation import ActionValidationError
 from app.schemas.actions import (
     ActionBatch,
     AddAction,
+    DeleteAction,
     MoveAction,
     ResizeAction,
     UpdateAction,
@@ -25,16 +26,15 @@ def plan_block_reason(state: QueryState) -> str | None:
         return "规划包含画布修改，当前尚未接入对应动作"
     if plan.resource_needs:
         return "规划仍有待获取资源，不能直接生成动作"
-    if any(
-        item.disposition not in {"add", "modify", "keep"} for item in plan.components
-    ):
-        return "当前规划执行支持新增、调整和保留组件，移除后续接入"
     additions = [item for item in plan.components if item.disposition == "add"]
+    removals = {
+        item.target_id for item in plan.components if item.disposition == "remove"
+    }
     modifications = {
         item.target_id: item for item in plan.components if item.disposition == "modify"
     }
-    if not additions and not modifications:
-        return "规划未包含可执行的新增或调整组件"
+    if not additions and not modifications and not removals:
+        return "规划未包含可执行的新增、调整或删除组件"
     if additions and (resources is None or resources.status != "resolved"):
         return "组件目录尚未就绪"
     supported = {item.type for item in resources.components} if resources else set()
@@ -54,10 +54,21 @@ def plan_block_reason(state: QueryState) -> str | None:
     # 已有目标的修改诉求不能通过 keep 或遗漏目标绕过
     supported_operations = {"move", "resize", "update", "restyle", "reflow", "layout"}
     changes = state["requirement"].changes
+    # 删除必须逐个目标获得明确授权，整体布局调整不隐含删除权限
+    allowed_removals = {
+        target
+        for change in changes
+        if change.target_scope == "nodes" and change.operation == "delete"
+        for target in change.target_ids
+    }
+    if removals != allowed_removals:
+        return "规划删除目标与需求不一致，不能遗漏或扩大删除范围"
     for change in changes:
         if change.target_scope == "screen" and change.operation == "add":
             if not additions:
                 return "规划遗漏新增需求"
+        elif change.target_scope == "nodes" and change.operation == "delete":
+            continue
         elif (
             change.target_scope in {"nodes", "screen"}
             and change.operation in supported_operations
@@ -149,10 +160,23 @@ def validate_plan_actions(
     materials = {item.key: item for item in resources.components} if resources else {}
     seen = set()
     modified = set()
+    removals = {
+        item.target_id
+        for item in state["screen_plan"].components
+        if item.disposition == "remove"
+    }
+    removed = set()
     errors = []
     for index, action in enumerate(batch.actions):
         message = None
-        if not isinstance(action, AddAction):
+        if isinstance(action, DeleteAction):
+            if action.target_id not in removals:
+                message = f"不能删除非 remove 规划目标: {action.target_id}"
+            elif action.target_id in removed:
+                message = f"不能重复删除组件: {action.target_id}"
+            else:
+                removed.add(action.target_id)
+        elif not isinstance(action, AddAction):
             if not isinstance(action, (MoveAction, ResizeAction, UpdateAction)):
                 message = "规划调整仅支持 move、resize 和 update"
             elif action.target_id not in modifications:
@@ -168,6 +192,10 @@ def validate_plan_actions(
             message = f"动作未关联有效的新增规划: {action.plan_id}"
         elif action.plan_id in seen:
             message = f"同一规划组件不能重复新增: {action.plan_id}"
+        elif action.node.id in {
+            node.id for node in state["input_context"].screen.nodes
+        }:
+            message = f"新增组件不能复用原有 ID: {action.node.id}"
         else:
             seen.add(action.plan_id)
             item = expected[action.plan_id]
@@ -202,6 +230,12 @@ def validate_plan_actions(
                 code="scope_error", message=f"遗漏调整规划组件: {sorted(missing)}"
             )
         )
+    if missing := removals - removed:
+        errors.append(
+            ActionValidationError(
+                code="scope_error", message=f"遗漏删除规划组件: {sorted(missing)}"
+            )
+        )
     return errors
 
 

app/actions/registry.py

@@ -4,6 +4,7 @@ from typing import Any
 
 from app.actions.add import AddHandler
 from app.actions.base import BaseActionHandler
+from app.actions.delete import DeleteHandler
 from app.actions.move import MoveHandler
 from app.actions.resize import ResizeHandler
 from app.actions.update import UpdateHandler
@@ -12,6 +13,7 @@ from app.schemas.screen import Screen
 
 # 新增操作时在此注册，未实现的操作明确报错
 ACTION_HANDLERS: dict[str, BaseActionHandler[Any]] = {
+    "delete": DeleteHandler(),
     "add": AddHandler(),
     "move": MoveHandler(),
     "resize": ResizeHandler(),