add dev resources; plumb GUI_ENV_FILE/API_ENV_FILE/API_DESI_DATA into run targets

gui/lib/local/dotenv/test/dotenv_test.odin

@@ -12,6 +12,16 @@ Test_Config :: struct {
 	ratio:   f64,
 }
 
+Tagged_Config :: struct {
+	api_url: string `env:"API_URL"`,
+	port:    int `env:"PORT"`,
+	debug:   bool `env:"DEBUG"`,
+}
+
+Tagged_Empty :: struct {
+	api_url: string `env:""`,
+}
+
 // load_env writes src to a unique temp file and parses it via parse_file.
 // The returned map owns its strings; callers must destroy it.
 load_env :: proc(t: ^testing.T, src: string) -> map[string]string {
@@ -199,3 +209,37 @@ test_decode_hex_and_negative_ints :: proc(t: ^testing.T) {
 	testing.expect(t, dotenv.decode(env, &cfg))
 	testing.expect(t, cfg.port == 31, "hex int should decode")
 }
+
+@(test)
+test_decode_honors_env_tags :: proc(t: ^testing.T) {
+	env := load_env(t, "API_URL=http://127.0.0.1:8080\nPORT=9090\nDEBUG=true\n")
+	defer dotenv.destroy(env)
+
+	cfg := Tagged_Config{}
+	testing.expect(t, dotenv.decode(env, &cfg))
+	defer delete(cfg.api_url)
+
+	testing.expect(
+		t,
+		cfg.api_url == "http://127.0.0.1:8080",
+		"env tag should bind API_URL",
+	)
+	testing.expect(t, cfg.port == 9090, "env tag should bind PORT")
+	testing.expect(t, cfg.debug == true, "env tag should bind DEBUG")
+}
+
+@(test)
+test_decode_empty_env_tag_falls_back_to_field_name :: proc(t: ^testing.T) {
+	env := load_env(t, "api_url=http://fallback\n")
+	defer dotenv.destroy(env)
+
+	cfg := Tagged_Empty{}
+	testing.expect(t, dotenv.decode(env, &cfg))
+	defer delete(cfg.api_url)
+
+	testing.expect(
+		t,
+		cfg.api_url == "http://fallback",
+		"empty env tag should use field name",
+	)
+}