feat(#446): plugins tab full parity — install from URL, provider selection, remove confirm, badges (#456)

* docs: document HermesScaffold padding foot-gun root cause in AGENTS.md

* feat(#446): plugins tab full parity — install from URL, provider selection, remove confirm, badges

- Add Install from URL section with force reinstall + enable after install toggles
- Add Plugin Provider selection section (memory provider + context engine dropdowns)
- Add rescan button in top bar actions
- Add confirmation dialog before removing plugins
- Show source badges, runtime status, auth badges on plugin cards
- Show dashboard slots from plugin manifest
- Add visibility toggle (show/hide in sidebar) for manifest plugins
- Show orphan dashboard plugins section
- Add PluginManifestData, PluginsHubProviders, ProviderOption models
- Add rescanPlugins, savePluginProviders, setPluginVisibility API endpoints

* fix(#446): fix CI compilation errors — DashboardPluginMeta mapping and @Composable context

* fix(#446): pass missing PluginInfo ctor params for orphan plugin mapping

* fix(#446): remove duplicate refresh button in plugins top bar

Scaffold's onRefresh param added a second refresh icon alongside the
rescan action button. Removed onRefresh/isRefreshing from HermesScaffold
and moved pull-to-refresh into a manual PullToRefreshBox wrapping the
content, keeping the rescan icon as the sole top-bar action.

* fix(#446): remove rescan icon from plugins top bar

Only one action icon left in top bar; pull-to-refresh (loadPlugins)
remains the sole refresh mechanism. rescanPlugins() viewmodel logic
is unchanged but now unreachable from the UI.

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/data/remote/HermesApiService.kt

@@ -29,6 +29,7 @@ import com.m57.hermescontrol.data.model.ModelOptionsResponse
 import com.m57.hermescontrol.data.model.PairingApproveRequest
 import com.m57.hermescontrol.data.model.PairingResponse
 import com.m57.hermescontrol.data.model.PairingRevokeRequest
+import com.m57.hermescontrol.data.model.PluginProvidersPutRequest
 import com.m57.hermescontrol.data.model.PluginsHubResponse
 import com.m57.hermescontrol.data.model.ProfileSoulResponse
 import com.m57.hermescontrol.data.model.ProfilesResponse
@@ -319,6 +320,20 @@ interface HermesApiService {
         @Path("name", encoded = true) name: String,
     ): Response<Unit>
 
+    @POST("api/dashboard/plugins/rescan")
+    suspend fun rescanPlugins(): Response<Unit>
+
+    @PUT("api/dashboard/plugin-providers")
+    suspend fun savePluginProviders(
+        @Body body: PluginProvidersPutRequest,
+    ): Response<Unit>
+
+    @POST("api/dashboard/plugins/{name}/visibility")
+    suspend fun setPluginVisibility(
+        @Path("name", encoded = true) name: String,
+        @Body body: Map<String, Boolean>,
+    ): Response<Unit>
+
     @GET("api/messaging/platforms")
     suspend fun getMessagingPlatforms(
         @Query("profile") profile: String? = null,