refactor(cli): unify daemon lifecycle management

[orga-agent]

Summary

• replace legacy sync daemon lifecycle commands with a foreground daemon owned by launchd/systemd user services
• add advisory ownership locking, independent service/application status, logs, and authentication-owned install/uninstall
• bound SIGINT/SIGTERM shutdown, supervise PowerSync actors, and preserve platform diagnostics
• document daemon recovery and lifecycle behavior

Verification

• cargo test --workspace
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo fmt --all --check
• daemon process tests: 8 passed
• service manager tests: 5 passed
• daemon lifecycle tests: 15 passed
• git diff --check