feat: add /llms.txt route for AI discoverability

src/app/llms.txt/route.ts

@@ -0,0 +1,95 @@
+import { NextResponse } from 'next/server'
+
+/**
+ * /llms.txt — Machine-readable site description for AI assistants and crawlers.
+ * This helps AI search engines (Perplexity, ChatGPT, etc.) understand what
+ * OpenPrompt offers and how to navigate the site.
+ * 
+ * Spec: https://llmstxt.org/
+ */
+
+const BASE_URL = process.env.NEXT_PUBLIC_APP_URL || 'https://open-prompt.netlify.app'
+
+export async function GET() {
+    const content = `# OpenPrompt
+
+> The GitHub for AI Prompts — Transform AI prompts into shareable micro-apps.
+
+## About
+
+OpenPrompt is an open-source platform where users create, share, remix, and run AI prompts as micro-apps. It supports multiple AI models (GPT-4, Claude, Gemini, Ollama) and includes 177+ built-in AI tools.
+
+## Key Pages
+
+- [Home](${BASE_URL}/) — Landing page with featured prompts and platform stats
+- [Explore Prompts](${BASE_URL}/explore) — Browse and search community-created prompts
+- [AI Tools](${BASE_URL}/tools) — 177+ AI-powered tools across 15 categories
+- [Image Prompts](${BASE_URL}/image-prompts) — Gallery for Midjourney, DALL-E, Stable Diffusion, FLUX
+- [AI Characters](${BASE_URL}/characters) — Chat with AI personas and expert mentors
+- [Thunderdome](${BASE_URL}/thunderdome) — Compare AI model outputs side-by-side
+- [Workflows](${BASE_URL}/workflows) — Chain multiple prompts together
+- [Creators](${BASE_URL}/creators) — Browse prompt creators and their profiles
+- [Leaderboard](${BASE_URL}/leaderboard) — Top creators ranked by engagement
+- [Collections](${BASE_URL}/collections) — Curated prompt collections
+- [Frameworks](${BASE_URL}/frameworks) — Prompt engineering frameworks (RACE, CARE, APE, etc.)
+- [Forum](${BASE_URL}/forum) — Community discussions and Q&A
+- [Pricing](${BASE_URL}/pricing) — Free and Pro plans
+- [API Docs](${BASE_URL}/docs/api) — Public API documentation
+- [Browser Extension](${BASE_URL}/extension) — Use prompts in ChatGPT, Claude, Gemini
+
+## Categories
+
+- Content — Writing, blogging, social media content
+- Development — Code generation, debugging, documentation
+- Marketing — Strategy, ads, campaigns, SEO
+- Business — Plans, pitches, analysis, financial models
+- Education — Lesson plans, quizzes, tutoring
+- Creative — Stories, scripts, poetry, art prompts
+- Research — Analysis, summaries, literature review
+
+## Tool Categories (177+ tools)
+
+- Prompting (9) — Optimizer, Chain-of-Thought, Meta-Prompt
+- Marketing (14) — Strategy, Ads, Campaigns, Funnels
+- Branding (11) — Names, Slogans, Voice, Guidelines
+- Copywriting (12) — Headlines, Landing Pages, CTAs
+- Business (15) — Plans, SWOT, Pitches, Financials
+- Email (10) — Sequences, Templates, Subject Lines
+- Product (12) — PRDs, Roadmaps, User Stories
+- HR (11) — Job Posts, Interviews, Onboarding
+- Personal Brand (8) — LinkedIn, Twitter, Bio Generators
+- Operations (9) — SOPs, KPIs, Process Improvement
+- Social Media (12) — Posts, Reels, Calendars, Hashtags
+- Education (10) — Lesson Plans, Quizzes, Curriculum
+- Development (15) — Code Review, Docs, API Design
+- Creative (14) — Stories, Scripts, Poetry, Art
+- Research (15) — Analysis, Summaries, Literature
+
+## Supported AI Models
+
+- OpenAI: GPT-4o, GPT-4o-mini
+- Anthropic: Claude 3.5 Sonnet, Claude 3 Haiku
+- Google: Gemini 2.5 Flash, Gemini 2.0 Flash
+- Local: 20+ Ollama models (Llama, Mistral, Phi, etc.)
+
+## API
+
+Public API available at \`${BASE_URL}/api/v1/\`
+- GET /api/v1/prompts — List prompts
+- GET /api/v1/prompts/:slug — Get a specific prompt
+- POST /api/v1/prompts/:slug/run — Execute a prompt
+
+## Contact
+
+- GitHub: https://github.com/Anky9972/open-prompt
+- Twitter: https://twitter.com/anky_vivek
+- Email: ankygaur9972@gmail.com
+`
+
+    return new NextResponse(content, {
+        headers: {
+            'Content-Type': 'text/plain; charset=utf-8',
+            'Cache-Control': 'public, max-age=86400, stale-while-revalidate=3600',
+        },
+    })
+}