Feat: add Maine DOC Insight desktop analytics tool

[gtonye]

Pre-Submission PR Checklist

• Unnecessary development comments removed
• All acceptance criteria verified
• Functions according to ticket specifications
• Tested manually where applicable
• Branch rebased with latest main
• No business logic exists within the database layer

Description of the change

Adds the Maine DOC Insight desktop analytics tool — a Tauri (Rust) + React + Chart.js application for exploring
Maine DOC education program data.

• Six dashboard views: Home (system KPIs), Programs (completion/waitlist rates), Residents (near-release and
  never-engaged rosters), Facilities (raw and mix-adjusted completion rates), Comparison (side-by-side facility view), and
  Data Quality (field-level missing data report)
• AI chat panel supporting Google Gemini, OpenAI, Anthropic Claude, and Ollama (local) — only aggregated metrics are
  sent externally; no resident names or DOC numbers leave the machine
• Automated data quality assessment on every loaded dataset with per-view badges and a dedicated quality view
• Demo mode for exploring sample responses without real data or an API key
• Accepts CSV and Excel exports from the Maine DOC/OMS system and UnlockEd platform CSVs

How to test the PR

• Follow the steps in the README.md

📝 Ensure that you can build and run the app locally

📝 Ensure that you can successfully create the desktop version using npm run tauri build

• Use the demo mode

📝 ensure that you get the visualization

• Using an API key, even a test one

📝 Ensure that you can chat with the data

Additional context