feat: update pricing page to include VIN Decoder as 4th API (#141)

- Update meta description to include VIN Decoder
- Change hero text from 'all three APIs' to 'all four APIs'
- Add VIN Decoder column to the pricing table with same 4-tier rates
- Add link to /vin-decoder docs page in the CTA row

npm run build exits 0; /pricing route builds successfully.

Closes leeworks-agents/api-company#141

docs-site/src/pages/pricing.astro

@@ -1,7 +1,7 @@
 ---
 import Base from '../layouts/Base.astro';
 ---
-<Base title="API Pricing" description="API Pricing — leeworks.dev — compare plans for ZIP Enrichment, Holidays, and Air Quality APIs">
+<Base title="API Pricing" description="API Pricing — leeworks.dev — compare plans for ZIP Enrichment, Holidays, Air Quality, and VIN Decoder APIs">
   <style>
     .pricing-hero { padding: 4rem 2rem 2rem; text-align: center; }
     .pricing-hero h1 { font-size: 2.5rem; font-weight: 800; background: linear-gradient(135deg, #90cdf4, #667eea); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 1rem; }
@@ -26,7 +26,7 @@ import Base from '../layouts/Base.astro';
 
   <div class="pricing-hero">
     <h1>API Pricing</h1>
-    <p>Simple, transparent pricing for all three APIs. Start free — upgrade when you need more.</p>
+    <p>Simple, transparent pricing for all four APIs. Start free — upgrade when you need more.</p>
   </div>
 
   <div class="pricing-wrap">
@@ -39,6 +39,7 @@ import Base from '../layouts/Base.astro';
           <th scope="col">ZIP Enrichment</th>
           <th scope="col">Holidays</th>
           <th scope="col">Air Quality</th>
+          <th scope="col">VIN Decoder</th>
         </tr>
       </thead>
       <tbody>
@@ -48,6 +49,7 @@ import Base from '../layouts/Base.astro';
           <td>100 req/mo &middot; 5 req/min</td>
           <td>100 req/mo &middot; 5 req/min</td>
           <td>100 req/mo &middot; 5 req/min</td>
+          <td>100 req/mo &middot; 5 req/min</td>
         </tr>
         <tr>
           <td class="tier-name">Basic</td>
@@ -55,6 +57,7 @@ import Base from '../layouts/Base.astro';
           <td>5,000 req/mo &middot; 60 req/min</td>
           <td>5,000 req/mo &middot; 60 req/min</td>
           <td>5,000 req/mo &middot; 60 req/min</td>
+          <td>5,000 req/mo &middot; 60 req/min</td>
         </tr>
         <tr>
           <td class="tier-name">Pro</td>
@@ -62,6 +65,7 @@ import Base from '../layouts/Base.astro';
           <td>25,000 req/mo &middot; 200 req/min</td>
           <td>20,000 req/mo &middot; 200 req/min</td>
           <td>20,000 req/mo &middot; 200 req/min</td>
+          <td>20,000 req/mo &middot; 200 req/min</td>
         </tr>
         <tr>
           <td class="tier-name">Ultra</td>
@@ -69,6 +73,7 @@ import Base from '../layouts/Base.astro';
           <td>100,000 req/mo &middot; 500 req/min</td>
           <td>100,000 req/mo &middot; 500 req/min</td>
           <td>100,000 req/mo &middot; 500 req/min</td>
+          <td>100,000 req/mo &middot; 500 req/min</td>
         </tr>
       </tbody>
     </table>
@@ -77,6 +82,7 @@ import Base from '../layouts/Base.astro';
       <a href="#" class="cta-btn">ZIP Enrichment on RapidAPI</a>
       <a href="#" class="cta-btn">Holidays on RapidAPI</a>
       <a href="#" class="cta-btn">Air Quality on RapidAPI</a>
+      <a href="/vin-decoder" class="cta-btn">VIN Decoder Docs</a>
     </div>
 
     <p class="disclaimer">Subscriptions managed via RapidAPI marketplace. Prices shown in USD. Rate limits apply per API key.</p>