types: ConfigV2 and RootFS (#13504)

Refactored the ConfigV2 and RootFS types from server/images.go to a new types/model/config.go file under the model package. Updated all references to use model.ConfigV2 and model.RootFS. This allows for use in other projects without worrying about compiling the c code in the llama package.

types/model/config.go

@@ -0,0 +1,32 @@
+package model
+
+// ConfigV2 represents the configuration metadata for a model.
+type ConfigV2 struct {
+	ModelFormat   string   `json:"model_format"`
+	ModelFamily   string   `json:"model_family"`
+	ModelFamilies []string `json:"model_families"`
+	ModelType     string   `json:"model_type"` // shown as Parameter Size
+	FileType      string   `json:"file_type"`  // shown as Quantization Level
+	Renderer      string   `json:"renderer,omitempty"`
+	Parser        string   `json:"parser,omitempty"`
+
+	RemoteHost  string `json:"remote_host,omitempty"`
+	RemoteModel string `json:"remote_model,omitempty"`
+
+	// used for remotes
+	Capabilities []string `json:"capabilities,omitempty"`
+	ContextLen   int      `json:"context_length,omitempty"`
+	EmbedLen     int      `json:"embedding_length,omitempty"`
+	BaseName     string   `json:"base_name,omitempty"`
+
+	// required by spec
+	Architecture string `json:"architecture"`
+	OS           string `json:"os"`
+	RootFS       RootFS `json:"rootfs"`
+}
+
+// RootFS represents the root filesystem configuration for a model.
+type RootFS struct {
+	Type    string   `json:"type"`
+	DiffIDs []string `json:"diff_ids"`
+}