refactor: simplify Docker and CI/CD to use unified config

- Replace symlinked Dockerfile with simplified version in root
- Reduce Docker build args (unified config provides defaults)
- Update CI/CD workflows to use minimal build arguments
- Add nginx.conf to root directory (replace docker/nginx.conf)
- Remove docker-bake references from CI/CD workflows
- Focus on essential runtime overrides only
- Let unified config handle smart defaults

.dockerignore

@@ -1 +0,0 @@
-docker/.dockerignore

.dockerignore

@@ -0,0 +1,113 @@
+# Node.js
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# Build outputs
+dist/
+build/
+.cache/
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# IDE and editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Git
+.git/
+.gitignore
+
+# Documentation
+README.md
+*.md
+docs/
+
+# Test files
+tests/
+test-results/
+coverage/
+playwright-report/
+
+# Development files
+.husky/
+.github/
+.gitea/
+
+# Logs
+logs/
+*.log
+
+# Runtime data
+pids/
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+*.lcov
+
+# Dependency directories
+jspm_packages/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# parcel-bundler cache (https://parceljs.org/)
+.parcel-cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+
+# Storybook build outputs
+.out
+.storybook-out
+
+# Temporary folders
+tmp/
+temp/
+
+# Configuration files not needed in container
+*.config.js
+*.config.ts
+!vite.config.ts
+!jest.config.json