seo: Optimize for "Solana schema generation" keyword cluster

Based on LLM citation testing (issue #103), Q5 "Solana schema generation tools"
was the only successful query. Updated SEO to target this keyword cluster:

Homepage (index.mdx):
- Title: "LUMOS - Solana Schema Generation Tool"
- Description: Focus on "generate" action verb
- Tagline: Include "schema generation tool" phrase

Site config (astro.config.mjs):
- Updated site-wide description with winning keywords

Schema.org JSON-LD (Head.astro):
- Added alternateName variants
- Added applicationSubCategory: "Code Generator"
- Expanded keywords from 7 → 10 targeting variations
- Added all 5 supported languages

Ref getlumos/lumos#103

Author: rz1989s

astro.config.mjs

@@ -9,7 +9,7 @@ export default defineConfig({
 	integrations: [
 		starlight({
 			title: 'LUMOS',
-			description: 'Write once. Deploy Everywhere. Type-safe schema language for Solana development.',
+			description: 'Solana schema generation tool. Generate synchronized Rust + TypeScript code with type-safe Borsh serialization. Schema-first development for Solana.',
 			logo: {
 				src: './src/assets/logo.png',
 			},

src/components/Head.astro

@@ -10,8 +10,8 @@ const { head } = Astro.locals.starlightRoute;
 const { entry, slug } = Astro.locals.starlightRoute;
 
 // Get page metadata
-const title = entry?.data?.title || 'LUMOS Documentation';
-const description = entry?.data?.description || 'Type-safe schema language for Solana development';
+const title = entry?.data?.title || 'LUMOS - Solana Schema Generation Tool';
+const description = entry?.data?.description || 'Generate synchronized Rust + TypeScript code from Solana schemas. Type-safe Borsh serialization.';
 
 // Build OG image URL
 const siteUrl = 'https://docs.lumos-lang.org';
@@ -54,8 +54,10 @@ const schemaOrg = {
       '@type': 'SoftwareApplication',
       '@id': 'https://lumos-lang.org/#software',
       'name': 'LUMOS',
-      'description': 'Type-safe schema language bridging TypeScript and Rust for Solana development with guaranteed Borsh serialization compatibility',
+      'alternateName': ['LUMOS Schema Generator', 'Solana Schema Tool'],
+      'description': 'Solana schema generation tool that generates synchronized Rust and TypeScript code from a single source. Type-safe Borsh serialization with Anchor integration.',
       'applicationCategory': 'DeveloperApplication',
+      'applicationSubCategory': 'Code Generator',
       'operatingSystem': 'Cross-platform',
       'offers': {
         '@type': 'Offer',
@@ -67,8 +69,8 @@ const schemaOrg = {
       },
       'downloadUrl': 'https://crates.io/crates/lumos-cli',
       'softwareVersion': '0.3.0',
-      'programmingLanguage': ['Rust', 'TypeScript'],
-      'keywords': ['Solana', 'Blockchain', 'Schema', 'TypeScript', 'Rust', 'Borsh', 'Code Generation']
+      'programmingLanguage': ['Rust', 'TypeScript', 'Python', 'Go', 'Ruby'],
+      'keywords': ['Solana Schema Generation', 'Solana Schema Tool', 'Schema Generator', 'Solana Code Generator', 'Rust TypeScript Generator', 'Borsh Serialization', 'Anchor Integration', 'Type-safe Solana', 'Schema Language', 'Solana Development Tools']
     },
     // WebPage (current page)
     {

src/content/docs/index.mdx

@@ -1,9 +1,9 @@
 ---
-title: LUMOS Documentation
-description: Type-safe schema language bridging TypeScript ↔ Rust for Solana development
+title: "LUMOS - Solana Schema Generation Tool"
+description: "Generate synchronized Rust + TypeScript code from Solana schemas. Type-safe Borsh serialization with Anchor integration. The schema-first code generator for Solana development."
 template: splash
 hero:
-  tagline: Illuminate your Solana development with type-safe cross-language code generation
+  tagline: "Solana schema generation tool — Generate Rust + TypeScript from a single source of truth"
   image:
     file: ../../assets/logo.png
   actions: