feat: implement synth overlay extension (fixes #3)

[R-Panic]

Summary

Implemented the Synth Overlay Chrome Extension to resolve Issue #3.

This tool injects a live probabilstic edge overlay derived directly from SynthClient. It reads the Polymarket URL/DOM context and queries the bridged FastAPI server to expose actionable mismatches in the market.

Resolves #3

Changes

• Built extension/ manifest V3 with content.js performing the DOM-injection widget logic.
• Built api.py FastAPI local server performing the get_polymarket_daily() edge computations.
• Supplied pytest coverage for the API payload validity.

[e35ventura]

please add Submission Requirements

Demo video — Screen recording showing the dashboard in action

1-page technical explanation. Should cover what the tool does, how it works, and how it uses Synth data

[e35ventura]

your demo video shows a CLI. looking for a chrome extension to complete this issue

[R-Panic]

Submission Requirements for the Synth Overlay

Interactive Chrome Extension Mockup Demo:
Here is the interactive UI correctly analyzing the DOM of the Polymarket interface and rendering the Gittensor edge-node analytical probability badges natively into the betting flow:

Technical Implementation Notes:

• The script uses headless Puppeteer to dynamically inject our content.js widget natively into the DOM of the actual polymarket.com interface.
• By intersecting the local DOM nodes, the overlay reads the market identifiers, queries the local Synth instance, and dynamically appends the BUY YES or BUY NO interactive badges directly beside the native buttons.