docs: precipitate Action/CRUD Lookup contract for skill authors

assets/schemas/skill-actions.schema.json

@@ -116,20 +116,66 @@
           "type": "string",
           "minLength": 1,
           "pattern": "^[a-z][a-z0-9_]*$",
-          "description": "可选。绑定业务表物理列名；replaces create/update 时宿主可复用该列的中文名与 lookup 下拉"
+          "description": "可选。绑定业务表物理列名；Action 弹窗（toolbar/batch）与 replaces create/update 抽屉均可复用该列的中文名与 lookup 下拉"
         },
         "display_type": {
           "type": "string",
-          "enum": ["textarea", "date", "datetime_unix_seconds", "url", "email"],
-          "description": "可选。表单控件提示；与 format 二选一即可。须与 CRUD display_type 语义对齐（见 ACTIONS.md / SCHEMA.md）。"
+          "enum": ["textarea", "date", "datetime_unix_seconds", "url", "email", "lookup"],
+          "description": "可选。表单控件提示；与 format 二选一即可。lookup=关联下拉（须配 lookup 对象或绑到已有 lookup 列）。须与 CRUD display_type 语义对齐（见 ACTIONS.md / SCHEMA.md）。"
         },
         "format": {
           "type": "string",
-          "enum": ["textarea", "date", "datetime_unix_seconds", "url", "email"],
+          "enum": ["textarea", "date", "datetime_unix_seconds", "url", "email", "lookup"],
           "description": "可选。display_type 别名，语义相同。"
+        },
+        "lookup": {
+          "$ref": "#/$defs/lookupConfig",
+          "description": "可选。内联同库表关联 Lookup（与列 options_json lookup 对象同构）。用于当前表没有对应列时；推荐同时设 display_type=lookup。见 ACTIONS.md「跨表引用：Lookup」。"
         }
       }
     },
+    "lookupConfig": {
+      "type": "object",
+      "required": ["ref_table", "value_column", "label_column"],
+      "additionalProperties": false,
+      "properties": {
+        "ref_table": {
+          "type": "string",
+          "minLength": 1,
+          "pattern": "^[a-zA-Z_][a-zA-Z0-9_]*$",
+          "description": "同库被引用表名"
+        },
+        "value_column": {
+          "type": "string",
+          "minLength": 1,
+          "pattern": "^[a-zA-Z_][a-zA-Z0-9_]*$",
+          "description": "提交值列（编号 / 外键）"
+        },
+        "label_column": {
+          "type": "string",
+          "minLength": 1,
+          "pattern": "^[a-zA-Z_][a-zA-Z0-9_]*$",
+          "description": "主文案列"
+        },
+        "extra_column": {
+          "type": "string",
+          "minLength": 1,
+          "pattern": "^[a-zA-Z_][a-zA-Z0-9_]*$",
+          "description": "可选。第三展示列；有值时宿主拼成「value · label（extra）」"
+        },
+        "filter_column": {
+          "type": "string",
+          "minLength": 1,
+          "pattern": "^[a-zA-Z_][a-zA-Z0-9_]*$",
+          "description": "可选。等值过滤列"
+        },
+        "filter_value": {
+          "type": ["string", "number", "boolean", "null"],
+          "description": "可选。与 filter_column 配对的等值"
+        }
+      },
+      "description": "同库 FK 式 Lookup。展示：value · label；有 extra 时 value · label（extra）。宿主亦接受 camelCase 键名。"
+    },
     "inputSchema": {
       "type": "object",
       "required": ["type", "properties"],
@@ -203,7 +249,7 @@
             "minLength": 1,
             "pattern": "^[a-z][a-z0-9_]*$"
           },
-          "description": "可选。将 inputSchema 属性名映射到业务表物理列名，供 replaces create/update 抽屉复用列 displayName / lookup options。"
+          "description": "可选。将 inputSchema 属性名映射到业务表物理列名，供 Action 弹窗与 replaces create/update 抽屉复用列 displayName / lookup options。"
         }
       },
       "description": "表级绑定；toolbar 必填。可选 inputMapping / columnMapping。concurrency/locks 勿写入。"