refactor: update API plugins version retrieval

Refactor getPluginVersion to accept PluginConfig parameter:
- Change signature from getPluginVersion(pluginName) to getPluginVersion(pluginName, cfg)
- Update all call sites to pass config
- Add TODO comment for future implementation querying actual plugin binary/container

Update plugin handlers to use dynamic version retrieval:
- GetV1Plugins: Use h.getPluginVersion(name, cfg) instead of hardcoded "1.0.0"
- PutV1PluginsPluginNameConfig: Pass newConfig to version retrieval
- GetV1PluginsPluginNameHealth: Use actual version from config

This prepares the API for dynamic version reporting while maintaining
backward compatibility with the current placeholder implementation.

internal/api/plugins/handlers.go

@@ -82,8 +82,8 @@ func (h *Handler) GetV1Plugins(w http.ResponseWriter, r *http.Request) {
 				Mode:            cfg.Mode,
 				Status:          "unknown",
 				Config:          cfg,
-				RequiresRestart: false,   // Default: plugins support hot-reload
-				Version:         "1.0.0", // Placeholder
+				RequiresRestart: false, // Default: plugins support hot-reload
+				Version:         h.getPluginVersion(name, cfg),
 			}
 
 			// Check if plugin is registered
@@ -196,7 +196,7 @@ func (h *Handler) PutV1PluginsPluginNameConfig(w http.ResponseWriter, r *http.Re
 	h.logger.Info("updated plugin config", "plugin", pluginName, "user", user.Name)
 
 	// Return updated plugin info with actual version
-	version := h.getPluginVersion(pluginName)
+	version := h.getPluginVersion(pluginName, newConfig)
 	info := PluginInfo{
 		Name:            pluginName,
 		Enabled:         newConfig.Enabled,
@@ -268,7 +268,7 @@ func (h *Handler) GetV1PluginsPluginNameHealth(w http.ResponseWriter, r *http.Re
 
 	response := map[string]any{
 		"status":    status,
-		"version":   "1.0.0",
+		"version":   h.getPluginVersion(pluginName, cfg),
 		"timestamp": time.Now().UTC(),
 	}
 
@@ -301,9 +301,10 @@ func (h *Handler) checkPermission(user *auth.User, permission string) bool {
 
 // getPluginVersion retrieves the version for a plugin
 // TODO: Implement actual version query from plugin binary/container
-func (h *Handler) getPluginVersion(pluginName string) string {
+func (h *Handler) getPluginVersion(pluginName string, cfg PluginConfig) string {
 	// In production, this should query the actual plugin binary/container
-	// For now, return a default version based on plugin name hash
-	_ = pluginName // Unused until actual implementation
+	// For now, return a default version
+	_ = pluginName
+	_ = cfg
 	return "1.0.0"
 }