perf: optimize data loading across Config, System, Profiles, and Billing tabs (#678)

* perf(model): optimize model tab load speed with two-phase fetch and loadQuick

* perf: optimize data loading across Config, System, Profiles, and Billing tabs

* chore: remove leftover bottom nav references and unused updatePrimaryScreens

* style: fix ktlint violations in Config/Profiles/Billing ViewModels

- property/argument-list wrapping for async(...) calls
- multiline-expression wrapping for async blocks
- remove unused import in ConfigViewModel
- break long error-message string literals to stay under 120 cols

---------

Co-authored-by: M57 <Hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/system/SystemViewModel.kt

@@ -159,6 +159,53 @@ class SystemViewModel :
         }
     }
 
+    // ── Targeted Data Reloads ──────────────────────────────────────────
+
+    fun loadCredentials() {
+        viewModelScope.launch {
+            val result = withContext(Dispatchers.IO) { safeApiCall { ApiClient.hermesApi.getCredentialPool() } }
+            if (result is NetworkResult.Success) {
+                _uiState.update { it.copy(credentials = result.data.providers ?: emptyList()) }
+            }
+        }
+    }
+
+    fun loadHooks() {
+        viewModelScope.launch {
+            val result = withContext(Dispatchers.IO) { safeApiCall { ApiClient.hermesApi.getHooks() } }
+            if (result is NetworkResult.Success) {
+                _uiState.update { it.copy(hooks = result.data) }
+            }
+        }
+    }
+
+    fun loadCurator() {
+        viewModelScope.launch {
+            val result = withContext(Dispatchers.IO) { safeApiCall { ApiClient.hermesApi.getCurator() } }
+            if (result is NetworkResult.Success) {
+                _uiState.update { it.copy(curator = result.data) }
+            }
+        }
+    }
+
+    fun loadMemory() {
+        viewModelScope.launch {
+            val result = withContext(Dispatchers.IO) { safeApiCall { ApiClient.hermesApi.getMemory() } }
+            if (result is NetworkResult.Success) {
+                _uiState.update { it.copy(memory = result.data) }
+            }
+        }
+    }
+
+    fun loadStatus() {
+        viewModelScope.launch {
+            val result = withContext(Dispatchers.IO) { safeApiCall { ApiClient.hermesApi.getStatus() } }
+            if (result is NetworkResult.Success) {
+                _uiState.update { it.copy(status = result.data) }
+            }
+        }
+    }
+
     // ── Gateway actions ────────────────────────────────────────────────
 
     fun startGateway() {
@@ -182,7 +229,7 @@ class SystemViewModel :
             when (result) {
                 is NetworkResult.Success -> {
                     _uiState.update { it.copy(toastMessage = "Gateway ${name}ed successfully") }
-                    loadAll()
+                    loadStatus()
                 }
 
                 is NetworkResult.Failure -> {
@@ -249,7 +296,7 @@ class SystemViewModel :
                             toastMessage = "Curator ${if (!currentlyPaused) "paused" else "resumed"}",
                         )
                     }
-                    loadAll()
+                    loadCurator()
                 }
 
                 is NetworkResult.Failure -> {
@@ -277,7 +324,7 @@ class SystemViewModel :
             when (result) {
                 is NetworkResult.Success -> {
                     _uiState.update { it.copy(toastMessage = "Memory ($target) reset successfully") }
-                    loadAll()
+                    loadMemory()
                 }
 
                 is NetworkResult.Failure -> {
@@ -329,7 +376,7 @@ class SystemViewModel :
                             toastMessage = "Credential added",
                         )
                     }
-                    loadAll()
+                    loadCredentials()
                 }
 
                 is NetworkResult.Failure -> {
@@ -353,7 +400,7 @@ class SystemViewModel :
             when (result) {
                 is NetworkResult.Success -> {
                     _uiState.update { it.copy(toastMessage = "Credential removed") }
-                    loadAll()
+                    loadCredentials()
                 }
 
                 is NetworkResult.Failure -> {
@@ -561,7 +608,7 @@ class SystemViewModel :
                             toastMessage = "Hook created",
                         )
                     }
-                    loadAll()
+                    loadHooks()
                 }
 
                 is NetworkResult.Failure -> {
@@ -588,7 +635,7 @@ class SystemViewModel :
             when (result) {
                 is NetworkResult.Success -> {
                     _uiState.update { it.copy(toastMessage = "Hook deleted") }
-                    loadAll()
+                    loadHooks()
                 }
 
                 is NetworkResult.Failure -> {