chore: repo cleanup + docs for admin API and DB schema (v1.2.8)

- remove stale docs/admin-frontend-spec.md (old Express/EJS admin), unused templates/ (SmartAdmin copy), dead scripts/sync-agents.cjs, committed dev.pid
- add docs/API.md (admin REST API reference) and docs/DATABASE.md (DB schema)
- refresh .env.example: drop stale ADMIN_PORT/SHOP_CONTAINER, add ADMIN_URL, HEALTH_PORT, DEFAULT_LANGUAGE, CHATBOT_API_*
- add npm run lint so Gitea workflows pass
- rebrand web-testing suite from APAW to telegram-shop

docker/docker-compose.web-testing.yml

@@ -18,7 +18,7 @@ services:
   # ─── Screenshot Capture: Create Baselines ─────────────────────────
   screenshot-baseline:
     image: mcr.microsoft.com/playwright:v1.52.0-noble
-    container_name: apaw-screenshot-baseline
+    container_name: tgshop-screenshot-baseline
     working_dir: /app
     volumes:
       - ../tests:/app/tests
@@ -38,7 +38,7 @@ services:
   # ─── Screenshot Capture: Create Current ──────────────────────────
   screenshot-current:
     image: mcr.microsoft.com/playwright:v1.52.0-noble
-    container_name: apaw-screenshot-current
+    container_name: tgshop-screenshot-current
     working_dir: /app
     volumes:
       - ../tests:/app/tests
@@ -58,7 +58,7 @@ services:
   # ─── Visual Regression: Compare Screenshots ──────────────────────
   visual-compare:
     image: node:24-alpine
-    container_name: apaw-visual-compare
+    container_name: tgshop-visual-compare
     working_dir: /app
     volumes:
       - ../tests:/app/tests
@@ -76,7 +76,7 @@ services:
   # Captures current screenshots and compares against baselines
   visual-tester:
     image: mcr.microsoft.com/playwright:v1.52.0-noble
-    container_name: apaw-visual-tester
+    container_name: tgshop-visual-tester
     working_dir: /app
     volumes:
       - ../tests:/app/tests
@@ -106,7 +106,7 @@ services:
   # ─── Console Error Monitor ──────────────────────────────────────
   console-monitor:
     image: mcr.microsoft.com/playwright:v1.52.0-noble
-    container_name: apaw-console-monitor
+    container_name: tgshop-console-monitor
     working_dir: /app
     volumes:
       - ../tests:/app/tests
@@ -131,7 +131,7 @@ services:
   # Uses @mizchi/vlmkit for AI-powered visual regression testing
   vlmkit:
     image: node:24-alpine
-    container_name: apaw-vlmkit
+    container_name: tgshop-vlmkit
     working_dir: /app
     volumes:
       - ../tests:/app/tests