chore(gitignore): update .gitignore to include additional directories and files

Added various directories and files to .gitignore to prevent them from being tracked, including IDE configurations, documentation, and seed data generator.

.gitignore

@@ -33,3 +33,19 @@ yarn-error.log*
 apps/admin/.env.staging
 apps/storefront/.env.staging
 convex/.env.staging
+
+# Others
+seed-data-generator/
+.agent/
+.gitea/
+.cursor/
+.idea/
+.vscode/
+docs/
+.claude/
+.aiassistant/
+add-shadcn-ui-mcp.md
+gitea-cicd-troubleshooting.md
+.gitignore
+some_html_template.html
+notes.md