feat: premium landing page, Swagger UI docs, full OG meta stack

- Premium landing page with nav, hero, stats, streaming flow, endpoint cards
- Full OG meta stack (OG, Twitter Card, JSON-LD WebAPI schema)
- SVG favicon matching miruro.tv icon style
- SVG share image for social sharing (1200x630)
- Dedicated docs.html with custom header and Swagger UI styling
- Canonical URLs, theme-color, robots meta
- Apple-touch-icon and mask-icon from miruro.tv
- Responsive design (mobile-friendly)
- Font: Inter (Google Fonts)

server.js

@@ -76,31 +76,7 @@ app.use(express.static(path.join(__dirname, "public"), { redirect: false }));
 
 // ---- FEATURE: Interactive Swagger UI documentation at /docs ----
 app.get("/docs", (req, res) => {
-  res.send(`<!DOCTYPE html>
-<html lang="en">
-<head>
-  <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>MiruroAPI — Swagger UI</title>
-  <link rel="stylesheet" href="https://unpkg.com/swagger-ui-dist@5/swagger-ui.css">
-  <style>body{margin:0;background:#0b1622;}</style>
-</head>
-<body>
-  <div id="swagger-ui"></div>
-  <script src="https://unpkg.com/swagger-ui-dist@5/swagger-ui-bundle.js"></script>
-  <script>
-    SwaggerUIBundle({
-      url: "/openapi.json",
-      dom_id: "#swagger-ui",
-      presets: [SwaggerUIBundle.presets.apis, SwaggerUIBundle.SwaggerUIStandalonePreset],
-      layout: "BaseLayout",
-      deepLinking: true,
-      defaultModelsExpandDepth: -1,
-      docExpansion: "list",
-    });
-  </script>
-</body>
-</html>`);
+  res.sendFile(path.join(__dirname, "public", "docs.html"));
 });
 
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