feat: scaffold SvelteKit project with Tailwind, TypeScript, ESLint, Prettier

Initialize the llm-multiverse-ui project with:
- SvelteKit + Svelte 5 (runes mode enabled)
- Tailwind CSS v4 via @tailwindcss/vite plugin
- TypeScript strict mode
- ESLint 9 flat config with svelte and typescript-eslint plugins
- Prettier with svelte plugin
- Directory structure: src/lib/components/, src/lib/services/
- All required scripts: dev, build, preview, lint, format, check

Closes #1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

implementation-plans/_index.md

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+# Implementation Plans Index
+
+| Issue | Title                                                  | Status       | Plan                         |
+| ----- | ------------------------------------------------------ | ------------ | ---------------------------- |
+| #1    | Project scaffolding: SvelteKit + Tailwind + TypeScript | IMPLEMENTING | [issue-001.md](issue-001.md) |

implementation-plans/issue-001.md

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+# Issue #1: Project scaffolding: SvelteKit + Tailwind + TypeScript
+
+**Status:** IMPLEMENTING
+**Issue:** https://git.shahondin1624.de/llm-multiverse/llm-multiverse-ui/issues/1
+**Branch:** `feature/issue-1-project-scaffolding`
+
+## Summary
+
+Initialize the SvelteKit project with Svelte 5 (runes mode), Tailwind CSS, TypeScript strict mode, proper directory structure, and ESLint + Prettier configuration.
+
+## Acceptance Criteria
+
+- [ ] SvelteKit project initialized with Svelte 5 (runes mode)
+- [ ] Tailwind CSS configured and working
+- [ ] TypeScript strict mode enabled
+- [ ] Directory structure: `src/lib/`, `src/routes/`, `src/lib/components/`
+- [ ] ESLint + Prettier configured
+- [ ] `dev`, `build`, `preview`, `lint`, `format` scripts in package.json
+
+## Implementation Phases
+
+### Phase 1: SvelteKit + TypeScript Initialization
+
+Use the SvelteKit scaffolding tool (`npx sv create`) to create the project in the current directory with:
+
+- SvelteKit with Svelte 5
+- TypeScript strict mode
+- Vite as the build tool
+
+Since we're in an existing git repo with just a README, we'll scaffold into a temp directory and move files over.
+
+### Phase 2: Tailwind CSS Integration
+
+Add Tailwind CSS v4 using the SvelteKit integration:
+
+- Install `@tailwindcss/vite` and `tailwindcss`
+- Configure the Vite plugin
+- Add Tailwind CSS import to app.css
+
+### Phase 3: Directory Structure
+
+Create the required directory structure:
+
+- `src/lib/` (SvelteKit default)
+- `src/lib/components/` — reusable UI components
+- `src/lib/services/` — API/service layer (for future issues)
+- `src/routes/` (SvelteKit default)
+
+### Phase 4: ESLint + Prettier
+
+Configure ESLint and Prettier using the SvelteKit recommended setup:
+
+- `eslint` + `@eslint/js` + `eslint-plugin-svelte` + `typescript-eslint`
+- `prettier` + `prettier-plugin-svelte`
+- Add `lint` and `format` scripts to package.json
+
+### Phase 5: Verify
+
+- Run `dev` server to confirm it starts
+- Run `build` to confirm production build works
+- Run `lint` and `format` to confirm tooling works
+- Verify TypeScript strict mode is active
+
+## Deviations
+
+(none yet)