[UX] `apc memory list` uses plain text while all other commands use rich tables

[FZ2000]

Problem

apc memory list uses raw click.echo() for all its output, while every other command in the CLI uses the shared ui.py rich helpers (tables, styled text, colors).

This creates a jarring inconsistency:

# apc memory list output (plain, unstyled)
[Collected Files]
  - claude-code/CLAUDE.md  (4.2 KB)

[preference]
  - Always use TypeScript strict mode  (manual_add)

Compared to apc skill list or apc mcp list which render polished rich tables.

Similarly, apc memory add uses click.echo() instead of the success() helper.

Suggested Fix

• Replace click.echo() in memory.py with the existing rich helpers from ui.py:
  • Use success() in the add command
  • Use memory_display() (already in ui.py) for memory list
• This brings memory commands in line with the rest of the CLI's visual style