Add editable Samba global configuration with net conf setparm

Backend:
- Use 'net conf setparm' to update individual parameters
- Accept dictionary of key-value pairs in API

Frontend:
- Add Edit/Cancel/Save buttons to Samba Config tab
- Inline editing of configuration values
- Save changes back to registry

Changes are applied immediately via net conf setparm.

Co-Authored-By: Patrick <patrick@perlbach24.de>

frontend/lib/api.ts

@@ -287,6 +287,11 @@ export class ZFSManagerAPI {
     return response.data
   }
 
+  async setSambaConfig(parameters: { [key: string]: string }): Promise<{ status: string }> {
+    const response = await this.client.put("/api/shares/samba/config", { parameters })
+    return response.data
+  }
+
   // Shares — NFS
   async getNfsShares(): Promise<NfsShare[]> {
     const response = await this.client.get("/api/shares/nfs")