fix(armaflex): rename misspelled 'armflex' slug to 'armaflex' everywhere

- Route /armflex -> /armaflex (page file + nav/listing links)
- Image folder public/images/armflex/ -> public/images/armaflex/
- Fix gallery alt-text 'Armflex' -> 'Armaflex'
- Add nginx 301 redirect so old /armflex URL still works (SEO-safe)
- Update engineering log + handoff

Verified: npm run build (44 pages), tsc --noEmit, nginx -t,
live probe /armaflex/ 200, zero stale 'armflex' refs.

docs/HANDOFF.md

@@ -1,6 +1,6 @@
 ---
 title: Deal Plus Tech Engineering Handoff
-updated: 2026-08-30
+updated: 2026-09-08
 ---
 # Engineering Handoff
 
@@ -8,13 +8,14 @@ updated: 2026-08-30
 
 - Repository: `/Users/kunthawat/Gitea/dealplustech-astroreal`
 - Branch: `main`
-- Code commit: `c0d8cacfbeb328424138b26e22cb31e82db453b6` (pushed and verified at `origin/main` before this handoff update)
+- Code commit: `c0d8cacfbeb328424138b26e22cb31e82db453b6` (last pushed to `origin/main` on 2026-08-30); Armaflex rename changes staged and pending this handoff commit
 - HEAD: current branch tip of `main`; verify with `git rev-parse HEAD` after the handoff update
 - Remote target: `origin/main`
-- Working tree: clean after the verified code commit; this handoff metadata update is the only pending change
+- Working tree: Armaflex slug/image rename + nginx 301 staged; handoff/log metadata is the only other pending change
 
 ## Completed
 
+- **Armaflex slug rename** — `armflex` → `armaflex` (route, image folder, nav/listing links, gallery alt-text) + nginx 301 for the old URL
 - CcooL product page: `/ฉนวนหุ้มท่อ-ccool/`
 - CcooL images and pricing PDF added under `public/`
 - Navigation, product listing, breadcrumb, metadata, FAQ, Product JSON-LD, and CTA tracking updated
@@ -25,12 +26,13 @@ updated: 2026-08-30
 
 ## Verification
 
-- `npm run build` → **pass**, 44 pages
-- `npx tsc --noEmit` → **pass**
-- `git diff --cached --check` → **pass**
-- Independent reviewer → **pass**, no security concerns or logic errors
-- Static output → 44 HTML pages, JSON-LD parses, Umami attributes are well-formed, images have `alt`; baseline-only duplicate SVG ID and blank-target links remain
-- Assets → five 1024×768 images; five-page A4 PDF; no PDF JavaScript/encryption
+- `npm run build` → **pass**, 44 pages (Armaflex rename)
+- `npx tsc --noEmit` → **pass** (no errors)
+- `git diff --check` → **pass**
+- `nginx -t` on the edited config → **syntax ok** (301 `armflex → armaflex`)
+- Live static probe on `dist/` → `GET /armaflex/` 200, `GET /images/armaflex/gallery-1.jpg` 200, old `/armflex/` 404 at static layer (nginx 301 intercepts at deploy)
+- Source/output scan → zero `armflex` references remain (all `armaflex`)
+- Independent reviewer (prior CcooL/SEO work) → **pass**, no security concerns or logic errors
 
 ## Known Limitations / Blockers
 
@@ -49,5 +51,6 @@ updated: 2026-08-30
 
 ## Evidence Index
 
+- [[2026-09-08-armaflex-slug-rename]]
 - [[2026-08-30-seo-audit-fixes]]
 - [[../test-evidence/2026-08-30-ccool-seo]]