feat(web): complete Blender route runtime execution

docs/tasks/WBV2-P1424-000.md

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+# WBV2-P1424-000: authorize server operator runtime closure
+
+- task: WBV2-P1424-000
+- parent: WBV2-P1423-001
+- status: done
+- nextTask: WBV2-P1424-001

docs/tasks/WBV2-P1424-001.md

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+# WBV2-P1424-001: complete server operator runtime closure
+
+- task: WBV2-P1424-001
+- parent: WBV2-P1424-000
+- status: in_progress
+- targetImplementationClass: PRODUCT_WORKFLOW
+- node tools/web/print-task-context.mjs
+
+## 目标
+
+Close the audited gap between classified feature routes and real browser/server execution.
+
+## 输入与范围
+
+- `tests/golden/WBV2/web-product-backlog.json`
+- `web/app/src/capabilities/blender-feature-route-catalog.json`
+- each pending task's owned paths
+
+## 验收
+
+- SERVER_NATIVE performs a real bounded HTTP Blender background job and returns a mutated blend
+- F3 loads typed operator properties on demand
+- browser-equivalent routes invoke existing browser workflows
+- verification remains incremental and behavioral evidence stays explicit
+
+## 失败边界
+
+- missing provider, malformed envelope, hash mismatch, timeout, cancellation and context-only operators fail closed
+- failed turns remain pending and never publish false completion
+
+## 交付与回滚
+
+- results: `tests/golden/WBV2/product-migration/*-result.json`
+- aggregate: `tests/golden/WBV2-P1424-001/product-implementation-report.json`
+- rollback: stop the runner and preserve the last completed runtime task