docs: enhance README and blueprint with Money Heist theme (#136)

[laypatel13]

Description

Enhances README.md and docs/blueprint.md with the Money Heist theme, matching the
vocabulary already live in the app (The Professor, The Vault, Mission Control,
Breach Attempts, Defense Strategy, Vault Logs).

Closes #136

Changes

• Reworded section intros/headers to lean into the heist theme while keeping all
  technical content, links, badges, and setup instructions unchanged
• Added a "Narrative & Copy Guidelines" table to blueprint.md mapping theme terms
  to what they refer to, for future contributors
• No code changes — docs only

Checklist

• Verified all original links, badges, and env var/script tables are intact
• Verified table of contents anchors still resolve after heading changes
• No functional/code changes

[vercel]

@laypatel13 is attempting to deploy a commit to the Gaurav's projects Team on Vercel.

A member of the Team first needs to authorize it.

[secure-flow]

🛡️ SecureFlow AI Security Report

✅ Scan completed successfully. No vulnerabilities found in the 2 analyzed files.

[GauravKarakoti]

Go through this

[secure-flow]

🛡️ SecureFlow AI Security Report

✅ Scan completed successfully. No vulnerabilities found in the 2 analyzed files.