Improve tree details endpoints performance

The TreeDetails page makes requests to multiple endpoints with concerning response times:

#### 1. GET /api/tree/{treeName}/{gitBranch}/{treeId}/summary
- Dashboard response time: ~2.5s
- Grafana average: 3.8s
- Also available as: `/api/tree/{treeId}/summary`

#### 2. GET /api/tree/{treeName}/{gitBranch}/{treeId}/full
- Dashboard response time: ~2.8s
- Grafana average: 1.5s
- Response size: >5MB for large trees
- Also available as: `/api/tree/{treeId}/full`

#### 3. GET /api/tree/{treeName}/{gitBranch}/{treeId}/commits
- Dashboard response time: ~13s
- Grafana average: 7s
- Also available as: `/api/tree/{treeId}/commits`

The commits endpoint (~13s) is particularly concerning as it blocks the
commit navigation graph from rendering, significantly impacting user experience.