Update application branding to dashAI

[Irozuku]

Summary

Standardizes branding across the application by replacing all user facing and backend references to "DashAI" with "dashAI".

---

Type of Change

Check all that apply like this [x]:

• Backend change
• Frontend change
• CI / Workflow change
• Build / Packaging change
• Bug fix
• Documentation

---

Changes (by file)

Backend

• DashAI/back/app.py

  • Updated FastAPI application title from DashAI to dashAI.
  • Updated API title from DashAI API v1 to dashAI API v1.

• DashAI/__main__.py

  • Updated CLI help text, logging messages, and window titles to use dashAI.

Dataset Sources

• HuggingFace, OpenML and Zenodo dataset sources implementation
  • Updated dataset source descriptions to use dashAI.

Frontend (i18n)

• All languages translation files
  • Replaced all occurrences of DashAI with dashAI in UI texts, tooltips, onboarding tours, plugin descriptions, and module descriptions.

---

Testing (optional)

• Verify application titles and API metadata display dashAI.
• Verify CLI help text and startup logs use dashAI.
• Review key frontend screens, onboarding tours, and tooltips across all languages to confirm consistent branding.