feat(mvp): phase 2 - database schema & services layer

Define full Prisma schema (10 models), run initial migration, build core
services (auth, user, group, app, board, permission), Zod validators,
type definitions, API response envelope, constants, and seed script.

src/lib/utils/constants.ts

@@ -0,0 +1,98 @@
+// User roles
+export const UserRole = {
+	ADMIN: 'admin',
+	USER: 'user'
+} as const;
+export type UserRole = (typeof UserRole)[keyof typeof UserRole];
+
+// Authentication modes
+export const AuthMode = {
+	LOCAL: 'local',
+	OAUTH: 'oauth',
+	BOTH: 'both'
+} as const;
+export type AuthMode = (typeof AuthMode)[keyof typeof AuthMode];
+
+// Auth providers
+export const AuthProvider = {
+	LOCAL: 'local',
+	OAUTH: 'oauth'
+} as const;
+export type AuthProvider = (typeof AuthProvider)[keyof typeof AuthProvider];
+
+// App status values
+export const AppStatusValue = {
+	ONLINE: 'online',
+	OFFLINE: 'offline',
+	DEGRADED: 'degraded',
+	UNKNOWN: 'unknown'
+} as const;
+export type AppStatusValue = (typeof AppStatusValue)[keyof typeof AppStatusValue];
+
+// Widget types
+export const WidgetType = {
+	APP: 'app',
+	BOOKMARK: 'bookmark',
+	NOTE: 'note',
+	EMBED: 'embed',
+	STATUS: 'status'
+} as const;
+export type WidgetType = (typeof WidgetType)[keyof typeof WidgetType];
+
+// Icon types
+export const IconType = {
+	LUCIDE: 'lucide',
+	SIMPLE: 'simple',
+	URL: 'url',
+	EMOJI: 'emoji'
+} as const;
+export type IconType = (typeof IconType)[keyof typeof IconType];
+
+// Permission levels (ordered by privilege)
+export const PermissionLevel = {
+	VIEW: 'view',
+	EDIT: 'edit',
+	ADMIN: 'admin'
+} as const;
+export type PermissionLevel = (typeof PermissionLevel)[keyof typeof PermissionLevel];
+
+// Permission hierarchy for comparison
+export const PERMISSION_HIERARCHY: Record<string, number> = {
+	[PermissionLevel.VIEW]: 1,
+	[PermissionLevel.EDIT]: 2,
+	[PermissionLevel.ADMIN]: 3
+};
+
+// Entity types for permissions
+export const EntityType = {
+	BOARD: 'board',
+	APP: 'app'
+} as const;
+export type EntityType = (typeof EntityType)[keyof typeof EntityType];
+
+// Target types for permissions
+export const TargetType = {
+	USER: 'user',
+	GROUP: 'group'
+} as const;
+export type TargetType = (typeof TargetType)[keyof typeof TargetType];
+
+// Healthcheck method
+export const HealthcheckMethod = {
+	GET: 'GET',
+	HEAD: 'HEAD'
+} as const;
+export type HealthcheckMethod = (typeof HealthcheckMethod)[keyof typeof HealthcheckMethod];
+
+// Defaults
+export const DEFAULTS = {
+	HEALTHCHECK_INTERVAL: 300,
+	HEALTHCHECK_TIMEOUT: 5000,
+	HEALTHCHECK_EXPECTED_STATUS: 200,
+	HEALTHCHECK_METHOD: 'GET',
+	JWT_EXPIRY: '15m',
+	REFRESH_TOKEN_EXPIRY_DAYS: 7,
+	DEFAULT_THEME: 'dark',
+	DEFAULT_PRIMARY_COLOR: '#6366f1',
+	SYSTEM_SETTINGS_ID: 'singleton'
+} as const;