* feat(output): add -f ndjson (implemented) and scaffold -f csv (#252)
`larksuite/cli` exposes --format ndjson / csv; dws only had json/table/raw/
pretty. This adds both as recognised global formats:
- ndjson: fully implemented (internal/output/ndjson.go) — top-level arrays
and well-known list wrappers ({items|results|data|records|...}) emit one
compact JSON document per line; anything else degrades to a single line.
Streaming-friendly counterpart to `-f json`.
- csv: scaffolded (internal/output/csv.go) — writeCSV currently returns a
clear "not implemented (#252)" error rather than silently degrading to
JSON. A TODO block spells out the planned implementation (reuse the table
renderer's extractRowsFromMap/rowsFromSlice flattening + encoding/csv).
Wired through Write() and normalizeFormat(); --format help string now lists
ndjson (csv to be added when writeCSV lands). Tests cover ndjson rendering
(array / wrapped-list / scalar) and pin the csv not-implemented contract.
Skeleton PR for #252 — ndjson is shippable as-is; csv is left for a
follow-up commit on this branch.
* feat(output): implement -f csv (#252)
Completes the CSV half of the format work. writeCSV mirrors the shape
decisions `-f table` already makes (reuses normalizePayload /
unwrapPrimaryObject / extractRowsFromMap / rowsFromSlice / formatValue) so
columns and value flattening are consistent between the two formats:
- a list of objects (bare or wrapped under items/results/data/records/...) →
header row + one row per element; union of keys sorted; missing values are
empty cells; nested objects/arrays render as compact JSON in the cell;
sibling metadata of the list (total, hasMore, ...) is dropped.
- a single object → two-column key,value CSV (keys sorted).
- a non-uniform list / scalar → single-column `value` CSV.
- empty / nil → empty document.
encoding/csv.Writer handles RFC-4180 quoting (commas, quotes, newlines);
cells go through formatValue (also strips terminal control sequences, same
as the table renderer). `--fields` projection composes for free since
WriteFiltered applies SelectFields before Write.
--format help now lists csv; FormatCSV doc comment dropped the WIP marker;
the not-implemented test is replaced with real coverage (list with
comma/CJK/nested-array-as-JSON, wrapped-list-with-metadata, single object,
scalar) plus a --fields composition test.
* feat(output): broadcast list metadata as trailing columns in -f csv (#252)
Per review preference: instead of dropping the list's sibling metadata
(total, hasMore, ...) when rendering {records:[...], total:N} as CSV, append
each meta key as a trailing column repeated on every row, so a CSV consumer
never silently loses it (CSV has no "footer table" the way the table
renderer does). Meta keys colliding with a data column are skipped; an empty
list still emits the header (data + meta) plus one row of empty data cells
carrying the meta values. New broadcastMeta helper; doc comment + tests
updated (incl. an empty-list-with-metadata case).
* feat(output): recognise real DingTalk envelope keys in -f csv/ndjson/table
之前 -f csv 和 -f ndjson 的 list 检测白名单只认 items/results/data/list/
records/tools/servers/products，但真实钉钉响应用的是 result（单数直接数组
或一层包裹）/documents/emailAccounts/todoCards/events/messages，导致大
部分 list 命令的 csv 输出退化成 key,value 二列、ndjson 退化成整包一行。
修复点：
1. preferredListKeys 扩展加上真实 envelope key（result/documents/
emailAccounts/todoCards/events/messages），并把它升级为 csv/table/
ndjson 共享的"单一事实源"——filter.go 的 findDataList 不再维护自己
的本地副本，直接复用这个列表。
2. extractRowsFromMap 改为委托 findDataList，自动获得"一层深度"的
wrapper 支持（{result: {todoCards: [...]}} 这种 envelope 现在能识
别）。meta 合并：outer + inner 双层 sibling 拉通，outer 同名 key
优先（避免 inner 把外层 success/total 等覆盖掉）。
3. writeTableish 和 writeCSV 调整 unwrapPrimaryObject 和
extractRowsFromMap 的优先级——先试 list 检测，没命中再走 unwrap，
避免 {result: {todoCards: [...]}} 被 unwrap 剥掉外层后直接走
key,value 分支。
4. findDataList 允许"空数组+preferred key" 命中，保留原来"空 list +
metadata 仍渲染为表格 + meta 广播一行"的行为。
新增 TestTabularDetectsRealDingTalkEnvelopes：四个真实 envelope 形态
（contact user search 的 result 直接数组、doc search 的 documents 顶层、
mail mailbox list 的 emailAccounts、todo task list 的 result.todoCards
一层深度）验证 ndjson 行数和 csv 表头都符合预期。
真接口回归（已登录态跑过）：
- dws contact user search -f csv → name/userId 列正常出表
- dws todo task list -f ndjson → 20 行一条任务，可 jq -r .subject 直接管
- dws doc search -f csv → 10 行 + nextPageToken 等 meta 广播尾列
- dws schema -f csv → 无回归
Closes part of #252 follow-up.
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