Improve Samba Global Configuration display in WebUI

Backend:
- Parse global config into structured key-value pairs
- Return parameters array instead of raw text
- Better handling of comments and empty lines

Frontend:
- Add 'Samba Config' tab to shares page
- Display config parameters in readable table format
- Color-code parameter names for clarity
- Add getSambaConfig() method to API client

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

frontend/lib/api.ts

@@ -282,6 +282,11 @@ export class ZFSManagerAPI {
     return response.data
   }
 
+  async getSambaConfig(): Promise<{ parameters: Array<{ key: string; value: string }> }> {
+    const response = await this.client.get("/api/shares/samba/config")
+    return response.data
+  }
+
   // Shares — NFS
   async getNfsShares(): Promise<NfsShare[]> {
     const response = await this.client.get("/api/shares/nfs")