Add dev container and VS Code configuration

[gianlazz]

Changes

.devcontainer/Dockerfile

• Base image: mcr.microsoft.com/devcontainers/typescript-node:24 (matches .nvmrc v24.16.0)
• Installs Docker CLI for building/running the production Dockerfile from within the container
• Pre-installs Playwright Chromium with system dependencies for e2e testing

.devcontainer/devcontainer.json

• Docker-from-Docker feature for accessing the host Docker daemon
• Forwards port 3000 (NestJS dev server) with auto-notify
• Sets DATABASE_TYPE=sqlite as default
• Runs npm install on post-create
• All 14 recommended VS Code extensions (Prettier, ESLint, Tailwind, HTMX, Jest, Playwright, GitLens, Docker, etc.)
• Editor settings: format on save, Prettier as default formatter, ESLint auto-fix, Tailwind in Handlebars
• Named volume mount for node_modules for cross-platform performance

.vscode/launch.json

• Debug NestJS config that launches npm run start:debug with auto-open browser
• Attach to NestJS config that attaches debugger to port 9229

.dockerignore

• Excludes node_modules, dist, data, .git, .devcontainer, .vscode, logs, and local env files from Docker builds