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TEND-37015 has been resolved via the Cursor Cloud Agent.

Outcome (from the agent run):
- OpenClaw: no references found in `SpiraledgeVN/app.tend.com-v2` (code/config/git history), so nothing needed to be removed.
- Cloudflare Gateway routing: confirmed the frontend already calls authenticated backend routes like `site/chatgpt/*` and `site/customcrop/harveststage/prompt`, which proxy to Cloudflare AI Gateway.
- Direct provider keys: none found in the frontend/application path for this feature.

Changes made on branch `cursor/agent-resolve-jira-ticket-tend-37015-start-from-branch-67ae`:
- Added centralized `LlmService` + `LLM_ENDPOINTS` under `libs/data-access/src/lib/services/llm/`
- Refactored `AiService`, `ReportService.generateAISummarize`, and `CropService.getListHarvestStageAI` to delegate to `LlmService`
- Added unit tests `libs/data-access/src/lib/services/llm/llm.service.spec.ts` (4/4 passing)
- Added documentation: `log/TEND-37015-llm-service-documentation.md`

Jira note:
- A draft PR was prepared for approval: `TEND-37015: Centralize AI calls in LlmService via Cloudflare Gateway`.