feat(plugin): 集成 WASM 插件系统到主服务并修复链路问题

- 新增 erp-plugin crate：插件管理、WASM 运行时、动态表、数据 CRUD
- 新增前端插件管理页面（PluginAdmin/PluginCRUDPage）和 API 层
- 新增插件数据迁移（plugins/plugin_entities/plugin_event_subscriptions）
- 新增权限补充迁移（为已有租户补充 plugin.admin/plugin.list 权限）
- 修复 PluginAdmin 页面 InstallOutlined 图标不存在的崩溃问题
- 修复 settings 唯一索引迁移顺序错误（先去重再建索引）
- 更新 wiki 和 CLAUDE.md 反映插件系统集成状态
- 新增 dev.ps1 一键启动脚本

Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "crates/erp-server/migration",
     "crates/erp-plugin-prototype",
     "crates/erp-plugin-test-sample",
+    "crates/erp-plugin",
 ]
 
 [workspace.package]
@@ -22,7 +23,7 @@ license = "MIT"
 tokio = { version = "1", features = ["full"] }
 
 # Web
-axum = "0.8"
+axum = { version = "0.8", features = ["multipart"] }
 tower = "0.5"
 tower-http = { version = "0.6", features = ["cors", "trace", "compression-gzip"] }
 
@@ -80,3 +81,4 @@ erp-auth = { path = "crates/erp-auth" }
 erp-workflow = { path = "crates/erp-workflow" }
 erp-message = { path = "crates/erp-message" }
 erp-config = { path = "crates/erp-config" }
+erp-plugin = { path = "crates/erp-plugin" }