v1.9.41: fix Grafana/Prometheus tabs — pass server dict to clients

- GrafanaTab/PrometheusTab: use store.get_server(alias) to get server
  dict instead of passing (alias, store) to client constructors
- Fix PrometheusTab: targets() and alerts() method names + parse response
- Fix GrafanaTab: build dashboard URL from client.base_url

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gui/tabs/grafana_tab.py

@@ -140,7 +140,10 @@ class GrafanaTab(ctk.CTkFrame):
 
     def _get_client(self) -> GrafanaClient:
         if self._client is None:
-            self._client = GrafanaClient(self._current_alias, self.store)
+            server = self.store.get_server(self._current_alias)
+            if not server:
+                raise ValueError(f"Server '{self._current_alias}' not found")
+            self._client = GrafanaClient(server)
         return self._client
 
     # ── Table population ──
@@ -194,10 +197,9 @@ class GrafanaTab(ctk.CTkFrame):
                 if url:
                     try:
                         client = self._get_client()
-                        full_url = client.get_dashboard_url(url)
+                        full_url = f"{client.base_url}{url}"
                         webbrowser.open(full_url)
                     except Exception:
-                        # Fallback: just open relative URL
                         webbrowser.open(url)
                 break