feat: social video uploads + hero page video + TikTok content

Hero page:
- Replace GIF with squaremcp-hero-loop.mp4 (autoplay, muted, loop)
- Update styles, scripts, tests, Dockerfile, baselines
- Deployed and verified

Social video uploads:
- Twitter/X: uploadVideoAndTweet via v1.1 media/upload + v2 tweets
- Facebook: createVideoPost via Graph API /{pageId}/videos
- Instagram: createReel via Graph API (container → poll → publish)
- TikTok: REST endpoints + OpenAPI schema for video upload

Marketing:
- TikTok content prompts, scripts, and posting schedule

Note: Remotion not mentioned in any user-facing content

product/site/index.html

@@ -51,16 +51,16 @@
 
         <section class="hero-panel" aria-labelledby="pilot-preview-title">
           <div class="hero-media">
-            <img
+            <video
               id="heroAnimation"
-              src="./squaremcp_launch.gif"
-              data-animated-src="./squaremcp_launch.gif"
-              data-poster-src="./squaremcp_launch_poster.png"
-              data-play-ms="9600"
-              alt="SquareMCP launch storyboard preview"
+              src="./squaremcp-hero-loop.mp4"
+              autoplay
+              muted
+              loop
+              playsinline
               width="728"
               height="410"
-            />
+            ></video>
           </div>
           <div class="panel-topline">Typical first deployment</div>
           <h2 id="pilot-preview-title">Internal support copilot with safe system access</h2>