refactor backend API structure

internal/httpapi/admin/settings/handler_settings_read.go

@@ -0,0 +1,41 @@
+package settings
+
+import (
+	"net/http"
+	"strings"
+
+	authn "ds2api/internal/auth"
+	"ds2api/internal/config"
+)
+
+func (h *Handler) getSettings(w http.ResponseWriter, _ *http.Request) {
+	snap := h.Store.Snapshot()
+	recommended := defaultRuntimeRecommended(len(snap.Accounts), h.Store.RuntimeAccountMaxInflight())
+	needsSync := config.IsVercel() && snap.VercelSyncHash != "" && snap.VercelSyncHash != h.computeSyncHash()
+	writeJSON(w, http.StatusOK, map[string]any{
+		"success": true,
+		"admin": map[string]any{
+			"has_password_hash":        strings.TrimSpace(snap.Admin.PasswordHash) != "",
+			"jwt_expire_hours":         h.Store.AdminJWTExpireHours(),
+			"jwt_valid_after_unix":     snap.Admin.JWTValidAfterUnix,
+			"default_password_warning": authn.UsingDefaultAdminKey(h.Store),
+		},
+		"runtime": map[string]any{
+			"account_max_inflight":         h.Store.RuntimeAccountMaxInflight(),
+			"account_max_queue":            h.Store.RuntimeAccountMaxQueue(recommended),
+			"global_max_inflight":          h.Store.RuntimeGlobalMaxInflight(recommended),
+			"token_refresh_interval_hours": h.Store.RuntimeTokenRefreshIntervalHours(),
+		},
+		"compat":      snap.Compat,
+		"responses":   snap.Responses,
+		"embeddings":  snap.Embeddings,
+		"auto_delete": snap.AutoDelete,
+		"history_split": map[string]any{
+			"enabled":             h.Store.HistorySplitEnabled(),
+			"trigger_after_turns": h.Store.HistorySplitTriggerAfterTurns(),
+		},
+		"model_aliases":     snap.ModelAliases,
+		"env_backed":        h.Store.IsEnvBacked(),
+		"needs_vercel_sync": needsSync,
+	})
+}