refactor: clean up codebase — remove legacy references, optimize dockerfile, prune .env.example, simplify CI/CD

- Traefik: remove asephstech/asephscloud SSL certs, fix api.insecure, add ping healthcheck
- .env.example: prune from 145 to 30 vars (remove Firebase, Discord, Coolify, etc.)
- scraper.Dockerfile: remove Node.js & Chromium from runtime, add healthcheck
- CI/CD: remove orphan container ref, commented blocks, fix lint workflow
- infra: remove mysql config (no active service), clean up middleware config
- root: remove .nvmrc (dup), renovate.json (use dependabot), simplify Makefile
- scripts: fix legacy package refs, simplify update-deps to use bun
- docs: remove stale handoff-log, quality-gates, superpowers designs, archived files
- compose: add healthchecks to traefik, redis, and scraper-api services

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

infra/compose/shared.yml

@@ -9,6 +9,12 @@ services:
           - redis
     ports:
       - '${SHARED_REDIS_EXPOSE:-127.0.0.1:6379:6379}'
+    healthcheck:
+      test: ['CMD', 'redis-cli', 'ping']
+      interval: 10s
+      timeout: 3s
+      retries: 3
+      start_period: 5s
     volumes:
       - 'redis_data:/data'