Add env-configurable GA/form/map; remove & artifacts; verify clone completeness

- Remove 4 stray '&' files (crawl artifact) that duplicated footer/about-us/contactus/root
- Replace hardcoded GA id, form email, map src with placeholders (GA_ID, FORM_EMAIL, GMAP_EMBED)
- Add entrypoint.sh: envsubst injects env vars into HTML at container startup
- Add .env.example + .dockerignore/.gitignore guarding .env secrets
- Google Map type A (free embed, no API key) configurable via GMAP_LAT/LNG
- Verify: all 39 pages, images (38/home), content blocks (296) match original; 0 missing assets

Full clone comparison against www.mitsuthailand.com confirms sections complete.

.env.example

@@ -0,0 +1,23 @@
+# ============================================================
+# มิตซูชัยพร static site — environment variables
+# Copy to `.env` (or set in EasyPanel service env) and adjust.
+# These get injected into the HTML at container startup by entrypoint.sh.
+# ============================================================
+
+# --- Google Analytics / GTM ---
+# Measurement ID (e.g. G-XXXXXXXXXX). Leave EMPTY to disable analytics.
+# GA_ID=G-L4835B8PSW
+GA_ID=
+
+# --- Contact / RFQ form email (FormSubmit) ---
+# Email that receives form submissions.
+FORM_EMAIL=mail@mitsuchaiyaporn.com
+
+# --- Google Map (type A — free embed, NO API key required) ---
+# Option 1: provide lat/lng (recommended)
+GMAP_LAT=13.557229094780995
+GMAP_LNG=100.28916297408983
+GMAP_ZOOM=16
+
+# Option 2: full embed URL (overrides lat/lng)
+# GMAP_EMBED=https://maps.google.com/maps?q=13.557229094780995,100.28916297408983&z=16&output=embed