fix(plugin): 修复坏插件模块声明击穿模块调度导致接口大面积报错

- projection 只接受映射类型的 get_module 声明，非法值跳过并记日志
- dispatcher 同步/异步路径防御非映射方法表，单个坏插件被隔离
- media 端点改用 application 层插件运行时门面，消除分层违规依赖
- 图片能力测试打桩 models.dev 目录边界，适配仓库内离线目录留空

Closes #6346

tests/fixtures/architecture/dependency-baseline.json

@@ -13,8 +13,8 @@
     "runtime_to_db": [],
     "workflow_to_db": []
   },
-  "edge_count": 6024,
-  "edge_sha256": "c0e243d720b7edbd3b842d8f9afd4ae5c7e0be6c8c745601986d2c938e4f23d8",
+  "edge_count": 6028,
+  "edge_sha256": "5d7edd263b74841b2b98cfdb032190e4a2dd2961733402eacbeba31b21ecf136",
   "edges": [
     "app -> app.runtime",
     "app -> app.runtime.compat",
@@ -1762,6 +1762,9 @@
     "app.api.endpoints.media -> app.api",
     "app.api.endpoints.media -> app.api.deps",
     "app.api.endpoints.media -> app.api.response",
+    "app.api.endpoints.media -> app.application",
+    "app.api.endpoints.media -> app.application.plugin",
+    "app.api.endpoints.media -> app.application.plugin.runtime",
     "app.api.endpoints.media -> app.chain",
     "app.api.endpoints.media -> app.chain.media",
     "app.api.endpoints.media -> app.chain.scraping",
@@ -1778,6 +1781,7 @@
     "app.api.endpoints.media -> app.schemas",
     "app.api.endpoints.media -> app.schemas.category",
     "app.api.endpoints.media -> app.schemas.context",
+    "app.api.endpoints.media -> app.schemas.event",
     "app.api.endpoints.media -> app.schemas.media",
     "app.api.endpoints.media -> app.schemas.response",
     "app.api.endpoints.media -> app.schemas.token",

tests/fixtures/architecture/runtime-contract-baseline.json

@@ -1612,7 +1612,7 @@
         "consumers": [
           {
             "caller": "app.chain.scraping",
-            "line": 586
+            "line": 597
           }
         ],
         "producers": [
@@ -1871,7 +1871,7 @@
     "producer_count": 66
   },
   "run_module": {
-    "call_count": 259,
+    "call_count": 260,
     "dynamic_call_count": 0,
     "dynamic_calls": [],
     "method_count": 211,
@@ -3010,6 +3010,11 @@
           "caller": "app.chain",
           "line": 1005,
           "mode": "sync"
+        },
+        {
+          "caller": "app.chain.scraping",
+          "line": 573,
+          "mode": "sync"
         }
       ],
       "metadata_nfo": [