feat: add project icon picker component and integrate with project management

- Implemented ProjectIconPicker component for selecting project icons.
- Created ProjectIcon component to display selected icons.
- Updated calendar page to remove unused PageHeading component.
- Modified growth page to enhance UI and improve text clarity.
- Refactored index page to include project icons and improve layout.
- Added mine page for user profile management with avatar selection.
- Introduced projects-sort page for managing project order with drag-and-drop functionality.
- Enhanced projects page to allow icon selection when adding or editing projects.
- Updated record page to streamline user experience and improve form actions.
- Adjusted practice service to support project icon management.
- Added tests for project saving functionality to ensure correct handling of icons.
- Updated global type definitions to support SVG and PNG imports.

backend/internal/database/002_project_icons.sql

@@ -0,0 +1,15 @@
+ALTER TABLE projects ADD COLUMN icon_id text NOT NULL DEFAULT '' CHECK (char_length(icon_id) <= 64);
+
+-- Existing installations have never offered icon selection. Seed familiar names
+-- once; subsequent migrations/logins must preserve explicit changes or removal.
+UPDATE projects SET icon_id = CASE name
+    WHEN '零基础' THEN 'plie'
+    WHEN '基础提升' THEN 'tendu'
+    WHEN '软开素质' THEN 'flexibility'
+    WHEN '足髋训练' THEN 'foot-hip'
+    WHEN '核心臀腿' THEN 'core-glutes'
+    WHEN '小球核心' THEN 'ball-core'
+    WHEN '天鹅臂颈' THEN 'swan-arms'
+    WHEN '呼吸训练' THEN 'breathing'
+    ELSE ''
+END;

backend/internal/database/003_project_order.sql

@@ -0,0 +1,2 @@
+-- Keep identity allocation for new projects while allowing owned projects to swap positions.
+ALTER TABLE projects ALTER COLUMN position SET GENERATED BY DEFAULT;

backend/internal/database/migrate.go

@@ -11,6 +11,12 @@ import (
 //go:embed 001_practice.sql
 var practiceSQL string
 
+//go:embed 002_project_icons.sql
+var projectIconsSQL string
+
+//go:embed 003_project_order.sql
+var projectOrderSQL string
+
 // Migrate applies versioned migrations atomically. A transaction-scoped lock keeps
 // concurrent service starts from applying the same version twice.
 func Migrate(ctx context.Context, pool *pgxpool.Pool) error {
@@ -25,17 +31,20 @@ func Migrate(ctx context.Context, pool *pgxpool.Pool) error {
 	if _, err = tx.Exec(ctx, "CREATE TABLE IF NOT EXISTS schema_migrations (version integer PRIMARY KEY, applied_at timestamptz NOT NULL DEFAULT now())"); err != nil {
 		return err
 	}
-	var applied bool
-	if err = tx.QueryRow(ctx, "SELECT EXISTS(SELECT 1 FROM schema_migrations WHERE version=1)").Scan(&applied); err != nil {
-		return err
-	}
-	if !applied {
-		if _, err = tx.Exec(ctx, practiceSQL); err != nil {
-			return fmt.Errorf("migration 1: %w", err)
-		}
-		if _, err = tx.Exec(ctx, "INSERT INTO schema_migrations(version) VALUES (1)"); err != nil {
+	for i, sql := range []string{practiceSQL, projectIconsSQL, projectOrderSQL} {
+		version := i + 1
+		var applied bool
+		if err = tx.QueryRow(ctx, "SELECT EXISTS(SELECT 1 FROM schema_migrations WHERE version=$1)", version).Scan(&applied); err != nil {
 			return err
 		}
+		if !applied {
+			if _, err = tx.Exec(ctx, sql); err != nil {
+				return fmt.Errorf("migration %d: %w", version, err)
+			}
+			if _, err = tx.Exec(ctx, "INSERT INTO schema_migrations(version) VALUES ($1)", version); err != nil {
+				return err
+			}
+		}
 	}
 	return tx.Commit(ctx)
 }