Merlyn: initial containerization setup
- Modified Dockerfile: amd64 only, merlyn user (UID 1117), python3/pip, simplified build
- Added _startup.sh: root-level startup, hands off to startup.sh as merlyn user
- Added startup.sh: yarn installs, frontend build, Prisma migrations, start server+collector
- Added server/requirements.txt: Python dependencies for merlyn-server
- Fixed collector/yarn.lock: epub2 git URL SSH->HTTPS with commit hash
- Fixed server/yarn.lock: zod version bumped to 3.25.76 to resolve zod-to-json-schema compatibility
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