Revert "feat: add GPT-5.5 model support"

[Hansen1018]

Reverts #11

[github-actions]

⚠️ PR Title Format Suggestion

Your PR title doesn't follow the Conventional Commits format, but this won't block your PR from being merged.

Current title: Revert "feat: add GPT-5.5 model support"

Recommended format: type(scope): description

Valid types:

feat, fix, docs, style, refactor, perf, test, chore, ci, security, build

Common scopes (optional):

exchange, trader, ai, api, ui, frontend, backend, security, deps, workflow, github, actions, config, docker, build, release

Examples:

• feat(trader): add new trading strategy
• fix(api): resolve authentication issue
• docs: update README
• chore(deps): update dependencies
• ci(workflow): improve GitHub Actions

Note: This is a suggestion to improve consistency. Your PR can still be reviewed and merged.

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[github-actions]

🐳 Docker Build Check Results

AMD64 builds: ✅ success
ARM64 build (native runner): ✅ success

🎉 All Docker builds passed!

✨ Using GitHub native ARM64 runners - 3x faster than emulation!

After merge, full multi-arch builds will run in ~10-12 minutes.

_{Checked: Backend (amd64 + arm64 native), Frontend (amd64) | Powered by GitHub ARM64 Runners}

[github-actions]

🤖 Advisory Check Results

These are advisory checks to help improve code quality. They won't block your PR from being merged.

📋 PR Information

Title Format: ⚠️ Suggestion - Consider using type(scope): description

Recommended format

Valid types: feat, fix, docs, style, refactor, perf, test, chore, ci, security, build

Examples:

• feat(trader): add new trading strategy
• fix(api): resolve authentication issue
• docs: update README

PR Size: 🟢 Small (14 lines: +3 -11)

🔧 Backend Checks

Go Formatting: ⚠️ Needs formatting

Files needing formatting

agent/brain.go
agent/execution_state.go
agent/onboard.go
agent/planner_runtime.go
agent/scheduler.go
agent/sentinel.go
agent/skill_dag.go
agent/skill_dag_runtime.go
agent/stock.go
agent/tools_test.go

Go Vet: ✅ Good
Tests: ✅ Passed

Fix locally:

go fmt ./...      # Format code
go vet ./...      # Check for issues
go test ./...     # Run tests

⚛️ Frontend Checks

Build & Type Check: ✅ Success

Fix locally:

cd web
npm run build  # Test build (includes type checking)

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