feat(server): add auth, user, and studio modules

Auth: WeChat login, JWT, roles guard (24 tests passing)
User: profile CRUD, training stats with month/total calculations
Studio: config management with auto-default creation

packages/server/src/studio/dto/update-studio.dto.ts

@@ -0,0 +1,53 @@
+import {
+  IsArray,
+  IsNumber,
+  IsOptional,
+  IsString,
+  IsUrl,
+  Max,
+  Min,
+} from 'class-validator'
+
+export class UpdateStudioDto {
+  @IsOptional()
+  @IsString()
+  name?: string
+
+  @IsOptional()
+  @IsString()
+  logo?: string
+
+  @IsOptional()
+  @IsString()
+  bannerUrl?: string
+
+  @IsOptional()
+  @IsString()
+  address?: string
+
+  @IsOptional()
+  @IsString()
+  phone?: string
+
+  @IsOptional()
+  @IsNumber()
+  @Min(-90)
+  @Max(90)
+  latitude?: number
+
+  @IsOptional()
+  @IsNumber()
+  @Min(-180)
+  @Max(180)
+  longitude?: number
+
+  @IsOptional()
+  @IsNumber()
+  @Min(0)
+  cancelHoursLimit?: number
+
+  @IsOptional()
+  @IsArray()
+  @IsString({ each: true })
+  photos?: string[]
+}