add dynamic profile update, connection helper, file download metadata

- replace UserSetColor/UserSetPronouns with single UserUpdateProfile that dynamically builds one UPDATE query from UserProfileUpdateList
- add getConnectionWithResponseOnFail helper to deduplicate connection ID parsing and validation across handlers
- rename file.go to attachmentFile.go and update handler names
- GetDownloadUrlAndMetadata now fetches object metadata via StatObject and returns it alongside the presigned URL
- file download endpoint returns JSON with url and originalName
- add description field to user and DB schema
- remove unused ConnectionState variants (GroupFellow, GroupFriend)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/httpRequest/get.go

@@ -2,6 +2,8 @@ package httpRequest
 
 import (
 	"context"
+	"go-socket/packages/convertions"
+	"net/http"
 
 	"go-socket/packages/cache"
 	"go-socket/packages/postgresql"
@@ -31,3 +33,16 @@ func getUserByToken(ctx context.Context, token string) (*types.User, error) {
 	}
 	return getUserById(ctx, userId)
 }
+func getConnectionWithResponseOnFail(response *http.ResponseWriter, request *http.Request, user *types.User) (*types.Connection, bool) {
+	connectionId, err := convertions.ConvertStringUuid(request.FormValue("connectionid"))
+	if err != nil {
+		http.Error(*response, "invalid connectionid", http.StatusBadRequest)
+		return nil, false
+	}
+	conn, ok := cache.CacheGetConnection(user, connectionId)
+	if !ok {
+		http.Error(*response, "invalid connectionid", http.StatusBadRequest)
+		return nil, false
+	}
+	return conn, true
+}