feat: fully implement profile controller;

feat: implement file upload handling in controller with size and type validation;
feat: add custom validation rules for bio and color hex fields;
refactor: enhance request handling with dedicated client info extraction;
chore: update profile DTOs with validation tags;
docs: profile controller swagger

backend/internal/dto/profile.go

@@ -18,12 +18,12 @@
 package dto
 
 type ProfileDto struct {
-	Name      string	`json:"name"`
-	Bio       string	`json:"bio"`
+	Name      string	`json:"name" binding:"required" validate:"name"`
+	Bio       string	`json:"bio" validate:"bio"`
 	AvatarUrl string	`json:"avatar_url"`
 	Birthday  int64		`json:"birthday"`
-	Color     string	`json:"color"`
-	ColorGrad string	`json:"color_grad"`
+	Color     string	`json:"color" validate:"color_hex"`
+	ColorGrad string	`json:"color_grad" validate:"color_hex"`
 }
 
 type ProfileSettingsDto struct {