feat(fraud): AI fraud detection engine for color and duplicate scans (#9)

[saidai-bhuvanesh]

🔗 Upstream Issue Connection

Closes #167

This Pull Request is officially linked to and resolves Issue #167 (Feature 9: AI Fraud Detection for Scans & Images) in the upstream repository.

Upon successful review, authorization, and merge, GitHub's integration will automatically close the linked issue. All development files, localization mappings, and page changes contained in this pull request directly address the requirements specified in the corresponding issue.

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What changes are made?

1. Gill Coloring Detection Heuristic (backend/main.py): Implemented color variance check on the backend. Highly disproportionate gill saturation (>90%) on deteriorated fish bodies (<55%) is flagged as artificial gill coloring fraud.
2. Duplicate Score Farming Blocker: Identified scan attempts with filenames containing 'duplicate' or 'copy' as score-manipulation attempts and flagged them.
3. Suspected Fraud Banner (src/pages/AnalysisDashboard.tsx): Designed a flashing warning block at the top of the dashboard displaying warning details if any fraud indicators are flagged.
4. I18n Localization Mappings: Localized fraud warning headers and descriptions in English, Hindi, and Bengali.

Technical Depth and Verification

Dyeing gills red is a common fraud practice in local fish markets to hide spoilage. By comparing gill color scores to body freshness index values, we can detect anomalous disparities programmatically. The UI warning banner immediately flags these scans, notifying consumers.

Tested by uploading a deteriorated fish scan with artificially inflated gill scores. The dashboard successfully renders the suspected fraud banner with details on the detected anomaly.

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[github-actions]

⚠️ No linked issue found!
This PR cannot be reviewed until a related issue is linked.
Please add Closes #issue_number in your PR description.

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📥 Commits

Reviewing files that changed from the base of the PR and between 97c6f33 and c3b04be.

📒 Files selected for processing (13)

• backend/main.py
• backend/vendors.py
• src/components/AnalyticsTrends.tsx
• src/fusionInference.js
• src/i18n/locales/bn.json
• src/i18n/locales/en.json
• src/i18n/locales/hi.json
• src/lib/api.ts
• src/lib/offlineDb.ts
• src/pages/AnalysisDashboard.tsx
• src/pages/Leaderboard.tsx
• src/pages/ResultsPage.tsx
• src/pages/ScannerPage.tsx

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