feat: add GitHub Copilot provider

[mizrael]

Summary

• add GitHub Copilot as a model provider with streaming generation and model discovery
• support encrypted OAuth credentials and a trusted-local GitHub device login flow
• add Copilot settings, authentication status, runtime packaging, documentation, and regression coverage
• harden fork CI, non-root container startup, and Playwright image selection

Security

• OAuth tokens are encrypted at rest; device credentials remain in the operating-system credential store
• device authentication is loopback-only, bare-process-only, and rejected in containers
• Copilot subprocesses receive a minimal allowlisted environment
• no credentials, tokens, prompts, screenshots, or private planning artifacts are included

Validation

• Backend tests pass across Python 3.11, 3.12, and 3.13
• Build, multi-architecture image packaging, non-root runtime check, and Playwright tests pass in GitHub Actions

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pypi/​litellm@​1.63.11 ⏵ 1.91.3		+75
	pypi/​openai@​1.74.0 ⏵ 2.45.0	-6
	pypi/​github-copilot-sdk@​1.0.6
	pypi/​uvicorn@​0.29.0 ⏵ 0.51.0
	pypi/​boto3@​1.37.34 ⏵ 1.43.49
	pypi/​cryptography@​43.0.3 ⏵ 48.0.1		+24
	pypi/​fastapi@​0.115.12 ⏵ 0.139.0	+1
	pypi/​pytest-asyncio@​1.3.0
	pypi/​fastapi-sso@​0.16.0 ⏵ 0.21.1	+1	+2

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: pypi orjson is 90.0% likely obfuscated Confidence: 0.90 Location: Package overview From: backend/uv.lock → pypi/orjson@3.11.9 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore pypi/orjson@3.11.9. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.
Warn		Install-time scripts: pypi granian Install script: Package overview Source: undefined From: backend/uv.lock → pypi/granian@2.7.9 ℹ Read more on: This package | This alert | What is an install script? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not be running non-essential scripts during install and there are often solutions to problems people solve with install scripts that can be run at publish time instead. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore pypi/granian@2.7.9. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.
Warn		Install-time scripts: pypi polars-runtime-32 Install script: Package overview Source: undefined From: backend/uv.lock → pypi/polars-runtime-32@1.42.1 ℹ Read more on: This package | This alert | What is an install script? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not be running non-essential scripts during install and there are often solutions to problems people solve with install scripts that can be run at publish time instead. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore pypi/polars-runtime-32@1.42.1. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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