Monitor: show Ollama's loaded models, their VRAM footprint, and busy state

The status snapshot now queries /api/ps (2s timeout so a wedged Ollama
cannot stall the channel) and the ollama line renders e.g.
'UP · llama3.1:8b (4.8 GiB VRAM) · busy'; comfy gets the busy marker
too while an image job runs.

internal/ollama/client.go

@@ -60,13 +60,21 @@ func (c *Client) Probe(ctx context.Context) error {
 
 type psResponse struct {
 	Models []struct {
-		Name  string `json:"name"`
-		Model string `json:"model"`
+		Name     string `json:"name"`
+		Model    string `json:"model"`
+		SizeVRAM int64  `json:"size_vram"` // bytes resident in VRAM (0 = RAM-only)
 	} `json:"models"`
 }
 
-// LoadedModels returns the names of models currently held in memory.
-func (c *Client) LoadedModels(ctx context.Context) ([]string, error) {
+// LoadedModel is one model currently held in memory.
+type LoadedModel struct {
+	Name     string
+	SizeVRAM int64 // bytes resident in VRAM; 0 when the model sits in RAM
+}
+
+// LoadedModelDetails returns the models currently held in memory with
+// their VRAM footprint.
+func (c *Client) LoadedModelDetails(ctx context.Context) ([]LoadedModel, error) {
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.base+"/api/ps", nil)
 	if err != nil {
 		return nil, err
@@ -84,13 +92,26 @@ func (c *Client) LoadedModels(ctx context.Context) ([]string, error) {
 	if err := json.NewDecoder(resp.Body).Decode(&ps); err != nil {
 		return nil, err
 	}
-	models := make([]string, 0, len(ps.Models))
+	models := make([]LoadedModel, 0, len(ps.Models))
 	for _, m := range ps.Models {
-		if m.Name != "" {
-			models = append(models, m.Name)
-		} else {
-			models = append(models, m.Model)
+		name := m.Name
+		if name == "" {
+			name = m.Model
 		}
+		models = append(models, LoadedModel{Name: name, SizeVRAM: m.SizeVRAM})
+	}
+	return models, nil
+}
+
+// LoadedModels returns the names of models currently held in memory.
+func (c *Client) LoadedModels(ctx context.Context) ([]string, error) {
+	details, err := c.LoadedModelDetails(ctx)
+	if err != nil {
+		return nil, err
+	}
+	models := make([]string, 0, len(details))
+	for _, m := range details {
+		models = append(models, m.Name)
 	}
 	return models, nil
 }