fix: all append blocks reuse managed config files instead of inlining

[Copilot]

The append mode blocks inlined config file content directly into .zshrc instead of reusing suitup's managed config files under ~/.config/zsh/. This caused duplicate loading if users later ran setup, and specifically for tools-init, the wrong fzf/atuin order broke atuin's Ctrl-R binding.

Changes

• src/append.js: All append blocks now consistently copy config files to ~/.config/zsh/ via copyIfNotExists and source them with source_if_exists, instead of inlining content. Affected blocks:
  • tools-init: replaced inline eval commands with sourcing shared/tools.zsh (fixes fzf/atuin order and adds caching)
  • zsh-options: replaced inlined options.zsh content with copy+source of core/options.zsh
  • env-vars: replaced inlined env.zsh content with copy+source of core/env.zsh
  • perf: replaced inlined perf.zsh content with copy+source of core/perf.zsh
  • fzf-config: replaced inlined fzf.zsh content with copy+source of shared/fzf.zsh
• tests/append.test.js: Updated test fixtures to match new source-based format; added tests verifying no content is inlined for each fixed block.

Before (example — tools-init):

# >>> suitup/tools-init >>>
command -v atuin  &>/dev/null && eval "$(atuin init zsh)"   # ← wrong order
command -v fzf    &>/dev/null && eval "$(fzf --zsh)"        # ← steals Ctrl-R
command -v zoxide &>/dev/null && eval "$(zoxide init zsh)"
command -v fnm    &>/dev/null && eval "$(fnm env ...)"
# <<< suitup/tools-init <<<

After (all blocks follow this pattern):

# >>> suitup/tools-init >>>
source_if_exists "$HOME/.config/zsh/shared/tools.zsh"
[[ -s "$HOME/.bun/_bun" ]] && source "$HOME/.bun/_bun"
# <<< suitup/tools-init <<<

tools.zsh already loads fzf before atuin (so atuin keeps Ctrl-R) and uses _source_cached_tool_init for faster startup. All other blocks similarly source their respective managed files, preventing duplication if the user later migrates to full setup mode.

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[ChangeHow]

@copilot 其他的 append 都没有问题了吗？检查过了吗？

[Copilot]

@copilot 其他的 append 都没有问题了吗？检查过了吗？

已全面检查并修复。除了 tools-init，还有 4 个 block 存在同样的问题——直接把配置内容 inline 到 .zshrc 而不是复用 ~/.config/zsh/ 下的托管文件：

• zsh-options：内联 options.zsh → 改为 copy+source core/options.zsh
• env-vars：内联 env.zsh → 改为 copy+source core/env.zsh
• perf：内联 perf.zsh → 改为 copy+source core/perf.zsh
• fzf-config：内联 fzf.zsh → 改为 copy+source shared/fzf.zsh

所有 block 现在统一使用 copyIfNotExists + source_if_exists 模式，与 template 保持一致，避免后续执行 setup 时产生重复加载。见 commit 36e119a。

[ChangeHow]

/close #25