Add Gemini-backed /api/generate-cards endpoint and update AI panel to use it#10

CoderBrianNguyen wants to merge 2 commits intoGeminiAPITestBranchCoderBrianNguyen/Hackathon2026:GeminiAPITestBranchfrom

codex/add-gemini-api-integration-for-flashcards-6unjk4CoderBrianNguyen/Hackathon2026:codex/add-gemini-api-integration-for-flashcards-6unjk4Copy head branch name to clipboard