refactor: replace debug console.logs with structured logging

[wulfmeister]

Replace 12 console.log statements with proper Log.Default.debug() calls:

• app.tsx: Route data debugging
• theme.tsx: Theme resolution debugging (2 logs)
• sync.tsx: Bootstrap debugging
• route.tsx: Navigation debugging
• prompt/index.tsx: Command debugging
• clipboard.tsx: Platform detection debugging (6 logs) Benefits:
• Configurable via log levels (DEBUG/INFO/WARN/ERROR)
• Structured output with metadata and timestamps
• File-based logging (~/.opencode/logs/)
• Consistent with rest of codebase
• Better production experience (no console spam) Testing:
• All type checks pass
• Manual TUI testing shows no console output
• Log files written correctly with structured entries"