Create public demo video or GIF

[sardorcodev]

Create a short demo video or GIF for the README and release page.

Scope:

• Show landing page.
• Show login/session flow.
• Show analyze flow with demo/manual coordinates.
• Show MVP/demo limitation labels.
• Avoid production-readiness claims.

Acceptance criteria:

• Demo media is added or linked.
• README references it.
• Video/GIF reflects current MVP behavior accurately.