[BUG] PluginServiceImpl.importData never publishes the create event (resource init skipped for imported plugins)

- severity: High
- files: `shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/PluginServiceImpl.java:257-274`
- description: In the import loop, after `pluginMapper.insertSelective(pluginDO) > 0`, the comment says `// publish create event. init plugin data`, but unlike the normal `create()` path (line 299-302 which calls `pluginEventPublisher.onCreated(pluginDO)`), the import path only increments `successCount` and never calls `pluginEventPublisher.onCreated`. So `ResourceServiceImpl.onPluginCreated` is never triggered for imported plugins.
- impact: Plugins imported via config import are persisted but their plugin-resource/permission initialization is silently skipped, leaving them in a half-initialized state.
- suggested_fix: Add `pluginEventPublisher.onCreated(pluginDO);` inside the `if (pluginMapper.insertSelective(pluginDO) > 0)` block.
- confidence: High
- related_existing: none. FUNC-A1/#6537 is about NamespacePluginServiceImpl.create, not PluginServiceImpl.importData.

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_Identified during the 2026-08-02 deep re-scan; full list in [`docs/scan2-2026-08-02/00-consolidated-critical-high.md`](docs/scan2-2026-08-02/00-consolidated-critical-high.md)._

Start in shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/PluginServiceImpl.java at importData lines 257-274, then compare the normal create() path at lines 299-302. Verify that a successfully imported plugin follows the same event-publication behavior and that plugin resource and permission initialization is no longer skipped.

Written by the indexing model from the issue text.