feat: Request timeout configuration

[Snider]

Summary

Configurable timeouts for different stages of requests.

Use Case

Some servers are slow, some hang forever. Need fine-grained timeout control.

Timeout Types

Timeout	Description
connect	TCP connection establishment
tls	TLS handshake
headers	Time to receive response headers
body	Time to download full body
total	Overall request timeout

Commands

# Total timeout
borg collect website https://slow-site.com --timeout 60s

# Specific timeouts
borg collect website https://slow-site.com \
  --connect-timeout 10s \
  --header-timeout 30s \
  --body-timeout 120s

# Disable timeout (dangerous)
borg collect website https://example.com --timeout 0

Configuration

timeouts:
  connect: 10s
  tls: 10s
  headers: 30s
  body: 300s      # 5 minutes for large files
  total: 600s     # 10 minutes max

# Per-domain overrides
domains:
  archive.org:
    body: 600s    # Archive.org is slow
  
  github.com:
    total: 60s    # Should be fast

Large File Handling

For large downloads, use:

• Progress-based timeout (no data in X seconds)
• Rather than absolute timeout

body_idle_timeout: 30s  # Timeout if no data for 30s

Acceptance Criteria

• Per-stage timeout configuration
• Per-domain overrides
• Idle timeout for large downloads
• Clear timeout error messages
• Graceful cleanup on timeout

[google-labs-jules]

Jules is on it. When finished, you will see another comment and be able to review a PR.

[google-labs-jules]

Ready for a review! A PR has been created.