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/docker/scraper.Dockerfile

@@ -1,49 +1,36 @@
-# Use cargo-chef for dependency caching
+# ── Build stage: cargo-chef for dependency caching ──
 FROM lukemathwalker/cargo-chef:latest-rust-1.89.0 AS chef
 WORKDIR /app
 
-# Install Node.js if needed for build scripts
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    nodejs \
-    && rm -rf /var/lib/apt/lists/*
-
 FROM chef AS planner
 COPY apps/scraper .
 RUN cargo chef prepare --recipe-path recipe.json
 
 FROM chef AS builder
 COPY --from=planner /app/recipe.json recipe.json
-# Utilize buildkit cache mounts for cargo
 RUN --mount=type=cache,target=/usr/local/cargo/registry \
     --mount=type=cache,target=/app/target \
     cargo chef cook --release --recipe-path recipe.json
 
-# Build application
 COPY apps/scraper .
 RUN --mount=type=cache,target=/usr/local/cargo/registry \
     --mount=type=cache,target=/app/target \
     cargo build --release && \
     cp target/release/scraper /app/scraper
 
-# Final runtime image
+# ── Runtime image ──
 FROM debian:bookworm-slim AS runtime
 RUN apt-get update && apt-get install -y --no-install-recommends \
     ca-certificates \
     curl \
     libssl3 \
-    chromium \
-    fonts-liberation \
-    fonts-noto-color-emoji \
     && rm -rf /var/lib/apt/lists/*
 
-# Add non-root user
 RUN groupadd -g 1001 appgroup && \
     useradd -u 1001 -g appgroup -s /bin/sh appuser
 
 WORKDIR /app
 COPY --from=builder /app/scraper /app/scraper
-
-# Run as non-root
 USER appuser
 
 EXPOSE 4091