chore: integrate AI development platform into HLL Vietnam project

ai/architecture-index.md

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+# Architecture Index
+
+This file gives AI agents a fast overview of HLL Vietnam before they inspect the repository in detail.
+
+## Application Type
+
+Community website repository with a static landing in the current phase and a planned Python backend in later phases.
+
+## Top-Level Structure
+
+### Documentation
+
+- `README.md`
+- `AGENTS.md`
+- `docs/`
+
+### Frontend
+
+- `frontend/index.html`
+- `frontend/assets/css/`
+- `frontend/assets/js/`
+- `frontend/assets/img/`
+
+### Backend
+
+- `backend/`
+- `backend/app/`
+
+### AI Platform
+
+- `ai/`
+- `ai/orchestrator/`
+- `ai/prompts/`
+- `ai/tasks/`
+
+### Automation And Support
+
+- `scripts/`
+- `.github/workflows/`
+
+## Current Technical Baseline
+
+- Frontend runtime is plain browser-loaded HTML, CSS and JavaScript.
+- There is no active backend runtime yet.
+- Python is the expected backend language for future development.
+- GitHub Actions and local PowerShell scripts may support the AI task workflow.
+
+## Editing Priorities
+
+- Product-facing changes usually start in `frontend/`.
+- Process and coordination changes usually start in `ai/`, `AGENTS.md` and `scripts/`.
+- Backend changes must remain preparatory unless a task explicitly changes that scope.
+
+## Validation Expectations
+
+- Frontend changes should remain compatible with local browser opening where applicable.
+- AI platform changes should keep task paths and documentation aligned.
+- Script changes should fail safely when optional tools or tests are not configured.