chore: add ESLint config, root package.json, and fix type import ordering

[Geliogabalus]

Summary

• Add root eslint.config.mjs with shared ESLint flat config for JS and TS files across all demos
• Add root package.json with lint, lint:fix, build, build:force, screenshot, and screenshot:update scripts, plus ESLint devDependencies
• Fix 252 TypeScript files to place regular imports before type imports
• Update README.md with a Root Scripts section documenting the new npm scripts

Details

eslint.config.mjs

• Covers .js, .jsx, .mjs and .ts, .tsx, .mts files
• Uses @typescript-eslint/eslint-plugin flat config preset (flat/recommended)
• Enforces 4-space indent, single quotes, semicolons, prefer-const, consistent-type-imports
• Ignores .github/, build/, dist/, node_modules/

Type import ordering

• Reordered imports in 252 TS/TSX files so import type statements always follow regular import statements
• 15 files with intentional section comments (e.g. ai-agent-builder, marketing-automation) were left untouched

Test plan

• Run npm install at the repo root
• Run npm run lint — should report no errors on the fixed files
• Spot-check a few TS files to confirm type imports appear after regular imports

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