chore: integrate AI development platform into HLL Vietnam project

ai/task-template.md

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+# TASK-XXX
+
+## Goal
+
+Describe the smallest useful objective for this task.
+
+## Context
+
+Explain where the change happens in HLL Vietnam and why it is needed now.
+
+## Steps
+
+1. Inspect the listed files first.
+2. Apply only the scoped change.
+3. Validate the result and document relevant findings.
+
+## Files to Read First
+
+List 3 to 6 files that must be reviewed before changing anything.
+
+Examples for this repository:
+
+- `AGENTS.md`
+- `ai/repo-context.md`
+- `ai/architecture-index.md`
+- `frontend/index.html`
+- `frontend/assets/css/styles.css`
+- `backend/README.md`
+
+Rules:
+
+- Read these files before implementation.
+- Keep the list small and directly relevant.
+- Prefer existing docs and code that already define the area being changed.
+
+## Expected Files to Modify
+
+List the files that should change during the task.
+
+Rules:
+
+- Prefer modifying only these files.
+- If additional files become necessary, explain why in the task outcome or commit message.
+- Do not modify unrelated files.
+
+## Constraints
+
+- Keep the change minimal.
+- Preserve HLL Vietnam project identity.
+- Do not introduce unnecessary frameworks or dependencies.
+- Do not implement backend functionality unless the task explicitly requires it.
+
+## Validation
+
+Before completing the task ensure:
+
+- scoped checks pass
+- no unrelated files were modified
+- documentation remains consistent with the repository state
+
+## Change Budget
+
+- Prefer fewer than 5 modified files.
+- Prefer changes under 200 lines when feasible.
+- Split the work into follow-up tasks if limits are exceeded.