server: support load model on startup, support preset-only options (#18206)

* server: support autoload model, support preset-only options

* add docs

* load-on-startup

* fix

* Update common/arg.cpp

Co-authored-by: Pascal <admin@serveurperso.com>

---------

Co-authored-by: Pascal <admin@serveurperso.com>

common/arg.cpp

@@ -96,6 +96,11 @@ common_arg & common_arg::set_sparam() {
     return *this;
 }
 
+common_arg & common_arg::set_preset_only() {
+    is_preset_only = true;
+    return *this;
+}
+
 bool common_arg::in_example(enum llama_example ex) {
     return examples.find(ex) != examples.end();
 }
@@ -3494,3 +3499,24 @@ common_params_context common_params_parser_init(common_params & params, llama_ex
 
     return ctx_arg;
 }
+
+void common_params_add_preset_options(std::vector<common_arg> & args) {
+    // arguments below won't be treated as CLI args, only preset options
+    args.push_back(common_arg(
+        {"load-on-startup"}, "NAME",
+        "in server router mode, autoload this model on startup",
+        [](common_params &, const std::string &) { /* unused */ }
+    ).set_env(COMMON_ARG_PRESET_LOAD_ON_STARTUP).set_preset_only());
+
+    // args.push_back(common_arg(
+    //     {"pin"},
+    //     "in server router mode, do not unload this model if models_max is exceeded",
+    //     [](common_params &) { /* unused */ }
+    // ).set_preset_only());
+
+    // args.push_back(common_arg(
+    //     {"unload-idle-seconds"}, "SECONDS",
+    //     "in server router mode, unload models idle for more than this many seconds",
+    //     [](common_params &, int) { /* unused */ }
+    // ).set_preset_only());
+}