feat: Implement initial full-stack application structure including frontend pages, components, hooks, API integration, and backend services for account pooling and management.

.gitignore

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+# =============================================================================
+# Codex Pool - Git Ignore
+# =============================================================================
+
+# ------------------------------------------------------------------------------
+# IDE & Editor
+# ------------------------------------------------------------------------------
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.DS_Store
+Thumbs.db
+
+# ------------------------------------------------------------------------------
+# Go
+# ------------------------------------------------------------------------------
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+go.work
+go.work.sum
+
+# Backend build output
+backend/codex-pool.exe
+backend/codex-pool
+backend/test_browser_auth.exe
+backend/test_browser_auth
+
+# ------------------------------------------------------------------------------
+# Node.js / Frontend
+# ------------------------------------------------------------------------------
+node_modules/
+frontend/node_modules/
+frontend/dist/
+frontend/.vite/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# ------------------------------------------------------------------------------
+# Data & Database
+# ------------------------------------------------------------------------------
+data/
+*.db
+*.db-journal
+*.db-shm
+*.db-wal
+backend/codex-pool.db
+backend/*.db
+
+# ------------------------------------------------------------------------------
+# Accounts & Sensitive
+# ------------------------------------------------------------------------------
+accounts*.json
+backend/accounts*.json
+*.pem
+*.key
+.env
+.env.*
+!.env.example
+
+# ------------------------------------------------------------------------------
+# Build & Cache
+# ------------------------------------------------------------------------------
+dist/
+build/
+*.cache
+.cache/
+
+# ------------------------------------------------------------------------------
+# Logs
+# ------------------------------------------------------------------------------
+*.log
+logs/
+
+# ------------------------------------------------------------------------------
+# Other Projects (if in same workspace)
+# ------------------------------------------------------------------------------
+TeamRegAPI/
+sub2api/
+team-reg-go/
+check_ban.py
+
+# ------------------------------------------------------------------------------
+# Temporary
+# ------------------------------------------------------------------------------
+*.tmp
+*.temp
+*.bak
+.kiro/specs/codex-pool-frontend/design.md
+.kiro/specs/codex-pool-frontend/requirements.md
+.kiro/specs/codex-pool-frontend/tasks.md