Fix: Include migration files in production Docker image

[nicholaspsmith]

Summary

• Fixed production deployment issue where the study_sessions table wasn't being created
• Added COPY commands to Dockerfile to include migration files in final image
• Moved tsx from devDependencies to dependencies (needed at runtime)

Root Cause

The Dockerfile runner stage wasn't copying:

• drizzle/ folder (migration SQL files)
• scripts/db-migrate.ts and scripts/post-migrate.ts
• drizzle.config.ts and lib/ folder

Test plan

• Verify Docker image builds successfully
• Verify migrations run on container startup
• Verify study sessions work in production

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