fix: only plugins with on_install are managed - skip others entirely

- Discover(): skip plugins without on_install hook (not shown in UI)
- Enable(): simplified - just check Installed flag
- SyncConfig(): simplified - no HasInstall special case
- Frontend: simplified toggle logic (only installed/uninstalled states)
- Tests: updated all test fixtures to include on_install hook

frontend/src/lib/SettingsPlugins.svelte

@@ -107,11 +107,11 @@
             </div>
           </div>
           <div class="plugin-toggle">
-            {#if p.hasInstall && !p.installed}
+            {#if !p.installed}
               <button class="install-btn" on:click={() => install(p)}>
                 📦 Установить
               </button>
-            {:else if p.hasInstall && p.installed}
+            {:else}
               <div class="toggle-group">
                 <button
                   class="toggle-btn"
@@ -126,16 +126,6 @@
                   🗑
                 </button>
               </div>
-            {:else}
-              <button
-                class="toggle-btn"
-                class:active={p.active}
-                on:click={() => toggle(p)}
-                role="switch"
-                aria-checked={p.active}
-              >
-                <span class="toggle-knob"></span>
-              </button>
             {/if}
           </div>
         </div>

internal/core/plugins/manager.go

@@ -130,14 +130,18 @@ func (m *Manager) Discover() {
 		os.MkdirAll(dataDir, 0o750)
 
 		hasInstall := meta.Hooks["on_install"] != ""
+		if !hasInstall {
+			log.Printf("[plugins] %s: skipping — no on_install hook (not a managed plugin)", e.Name())
+			continue
+		}
 
 		m.plugins = append(m.plugins, Plugin{
-			Meta:      meta,
-			Dir:       filepath.Join(pluginsDir, e.Name()),
-			DataDir:   dataDir,
-			Active:    false,
-			Installed: false,
-			HasInstall: hasInstall,
+			Meta:       meta,
+			Dir:        filepath.Join(pluginsDir, e.Name()),
+			DataDir:    dataDir,
+			Active:     false,
+			Installed:  false,
+			HasInstall: true,
 		})
 	}
 }
@@ -158,10 +162,6 @@ func (m *Manager) SyncConfig(cfg *config.AppConfig) {
 	}
 	for i := range m.plugins {
 		installed := installedSet[m.plugins[i].Meta.Name]
-		// Plugins without on_install hook are always "installed"
-		if !m.plugins[i].HasInstall {
-			installed = true
-		}
 		m.plugins[i].Installed = installed
 		m.plugins[i].Active = installed && enabledSet[m.plugins[i].Meta.Name]
 	}
@@ -352,16 +352,14 @@ type NodeMeta struct {
 	Type  string `json:"type"` // text, url, etc.
 }
 
-// Enable activates a plugin by name.
-// If the plugin has on_install hook, it must be installed first.
+// Enable activates a plugin by name. Plugin must be installed first.
 func (m *Manager) Enable(name string) error {
 	for i := range m.plugins {
 		if m.plugins[i].Meta.Name == name {
-			p := &m.plugins[i]
-			if p.HasInstall && !p.Installed {
+			if !m.plugins[i].Installed {
 				return fmt.Errorf("plugin %q must be installed first", name)
 			}
-			p.Active = true
+			m.plugins[i].Active = true
 			return nil
 		}
 	}

internal/core/plugins/manager_test.go

@@ -41,7 +41,8 @@ func TestDiscover(t *testing.T) {
 				"plugin.json": []byte(`{
 					"name": "client",
 					"version": "1.0.0",
-					"description": "Client template",
+					"description": "Client plugin",
+					"hooks": { "on_install": "on_install" },
 					"templates": ["client"]
 				}`),
 			},
@@ -78,7 +79,8 @@ func TestDiscover(t *testing.T) {
 		t.Errorf("plugin name = %q", plugins[0].Meta.Name)
 	}
 
-	// Enable plugin to load templates
+	// Install & enable plugin to load templates
+	mgr.Install("client")
 	mgr.Enable("client")
 
 	// Templates.
@@ -104,12 +106,12 @@ func TestEnableDisable(t *testing.T) {
 	root := setupPluginDir(t, map[string]*fsDir{
 		"plugin-a": {
 			files: map[string][]byte{
-				"plugin.json": []byte(`{"name": "a", "version": "1.0"}`),
+				"plugin.json": []byte(`{"name": "a", "version": "1.0", "hooks": {"on_install": "on_install"}}`),
 			},
 		},
 		"plugin-b": {
 			files: map[string][]byte{
-				"plugin.json": []byte(`{"name": "b", "version": "1.0"}`),
+				"plugin.json": []byte(`{"name": "b", "version": "1.0", "hooks": {"on_install": "on_install"}}`),
 			},
 		},
 	})
@@ -126,7 +128,9 @@ func TestEnableDisable(t *testing.T) {
 		t.Errorf("active after discover = %d, want 0", len(mgr.Active()))
 	}
 
-	// Enable both.
+	// Install & enable both.
+	mgr.Install("a")
+	mgr.Install("b")
 	mgr.Enable("a")
 	mgr.Enable("b")
 	if len(mgr.Active()) != 2 {
@@ -148,12 +152,14 @@ func TestEnableDisable(t *testing.T) {
 
 func TestActiveNames(t *testing.T) {
 	root := setupPluginDir(t, map[string]*fsDir{
-		"p1": {files: map[string][]byte{"plugin.json": []byte(`{"name":"p1"}`)}},
-		"p2": {files: map[string][]byte{"plugin.json": []byte(`{"name":"p2"}`)}},
+		"p1": {files: map[string][]byte{"plugin.json": []byte(`{"name":"p1","hooks":{"on_install":"on_install"}}`)}},
+		"p2": {files: map[string][]byte{"plugin.json": []byte(`{"name":"p2","hooks":{"on_install":"on_install"}}`)}},
 	})
 
 	mgr := NewManager(root)
 	mgr.Discover()
+	mgr.Install("p1")
+	mgr.Install("p2")
 	mgr.Enable("p1")
 	mgr.Enable("p2")
 	mgr.Disable("p1")

internal/core/plugins/runtime_test.go

@@ -215,7 +215,7 @@ func TestPluginManager_InitRuntimes(t *testing.T) {
 	pj := `{
 		"name": "testp",
 		"version": "1.0.0",
-		"hooks": { "on_init": "on_init" }
+		"hooks": { "on_install": "on_install", "on_init": "on_init" }
 	}`
 	if err := os.WriteFile(filepath.Join(pluginsDir, "plugin.json"), []byte(pj), 0644); err != nil {
 		t.Fatal(err)
@@ -228,6 +228,7 @@ func TestPluginManager_InitRuntimes(t *testing.T) {
 
 	mgr := NewManager(dir)
 	mgr.Discover()
+	mgr.Install("testp")
 	mgr.Enable("testp")
 	mgr.InitRuntimes()
 	defer mgr.CloseRuntimes()