Remaining CLI commands ignore global --data-dir (same class as #854/#897)

[Dumbris]

Follow-up from #897 verification. Bare config.Load() without the global --data-dir override remains in:

• activity_cmd.go (3 sites), connect_cmd.go, credential_cmd.go, feedback_cmd.go, registry_cmd.go, security_cmd.go, telemetry_cmd.go
• tui_cmd.go — feeds cfg.DataDir into socket.DetectSocketPath, so mcpproxy tui --data-dir D targets the wrong daemon (same user-visible bug as token CLI ignores global --data-dir for daemon socket detection (missed by #854) #897)
• status_cmd.go — same, DetectSocketPath at status_cmd.go:160

doctor/auth/call/code/tools were fixed in #854, upstream was always correct, token fixed in #907. Suggested fix: apply the same 3-line loader override per command (or finally extract one shared loader), and extend TestLoadersHonorGlobalDataDirFlag with a row per command so nothing can drift again.

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