fix: remove client-side AI provider key usage

[saurabhhhcodes]

Summary

• route frontend troubleshooting requests through the existing backend AI endpoint
• route frontend ticket analysis through the backend analyze endpoint
• remove direct client-side provider key usage from the browser bundle

Closes #3342

Validation

• node --check Frontend/src/services/aiAssistant.js
• git diff --check

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Configuration used: defaults

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Run ID: 73d099a8-b8df-4f01-9a48-8b750db148f5

📥 Commits

Reviewing files that changed from the base of the PR and between da8faf2 and 3d9a509.

📒 Files selected for processing (5)

• .gitignore
• .npm-cache/_update-notifier-last-checked
• .vscode/settings.json
• Frontend/src/services/aiAssistant.js
• backend/main.py

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