docs(installation): add OpenSSL as a prerequisite

Users building from source via Cargo on minimal systems hit a linker
error with no hint in the docs. Added OpenSSL to the Prerequisites
section in both documentation surfaces (markdown + HTML view) with
per-platform package names and an `openssl version` verify command.

Closes add-missing-openssl-prerequisite-to-the-getting-started-installation-docs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Olivier Bonnaure

www/app/views/docs/getting-started/installation.html.slv

@@ -14,7 +14,7 @@
         Prerequisites
     </h2>
 
-    <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-12">
+    <div class="grid grid-cols-1 md:grid-cols-3 gap-4 mb-12">
         <div class="p-4 rounded-xl bg-white/5 border border-white/10">
             <h3 class="font-semibold text-white mb-2">Node.js</h3>
             <p class="text-sm text-gray-400">v16 or higher (for Tailwind CSS)</p>
@@ -25,6 +25,11 @@
             <p class="text-sm text-gray-400">Package manager</p>
             <code class="text-xs text-indigo-300 mt-2 block">npm --version</code>
         </div>
+        <div class="p-4 rounded-xl bg-white/5 border border-white/10">
+            <h3 class="font-semibold text-white mb-2">OpenSSL</h3>
+            <p class="text-sm text-gray-400">Required to build from source (<code class="text-indigo-300">libssl-dev</code> / <code class="text-indigo-300">openssl-devel</code> / Homebrew <code class="text-indigo-300">openssl</code>)</p>
+            <code class="text-xs text-indigo-300 mt-2 block">openssl version</code>
+        </div>
     </div>
 
     <h2 class="text-2xl font-bold text-white mb-6 flex items-center gap-3">

www/docs/installation.md

@@ -4,6 +4,11 @@
 
 - Node.js (v16 or higher)
 - npm or yarn
+- OpenSSL — required to build from source via Cargo
+  - Debian/Ubuntu: `sudo apt install libssl-dev`
+  - Fedora/RHEL: `sudo dnf install openssl-devel`
+  - macOS (Homebrew): `brew install openssl`
+  - Verify: `openssl version`
 
 ## Install SoliLang