docs(filesystem): document write() mode=create (#1608)

[r266-tech]

Summary

PR #1608 added mode=\"create\" to POST /api/v1/content/write (plus ov write --mode create CLI flag), with a .md/.txt/.json/.yaml/.yml/.toml/.py/.js/.ts extension whitelist and 409 Conflict on existing paths. docs/en/api/03-filesystem.md and docs/zh/api/03-filesystem.md still describe write() as strictly an update operation, so consumers reading the HTTP API reference cannot discover the new capability without reading openviking/storage/content_write.py.

Changes

Mirror edits in EN + ZH filesystem API docs, scoped to the write() section:

• Section intro: mention mode=\"create\" as an alternative to updating.
• Parameter table mode row: values extended to replace, append, or create.
• Notes: replace the single "only existing files" bullet with a two-bullet pair — semantics split (replace/append need existing file, create returns 409 on existing) + the extension whitelist plus automatic parent-directory creation.

No CLI example changes (stays a replace example to avoid scope creep); the CLI section can be expanded in a follow-up if maintainers prefer. No code changes.

Verification

• Extension whitelist and 409 behavior transcribed verbatim from _CREATE_ALLOWED_EXTENSIONS / _create_and_write / _safe_stat branching in feat(content-write): 支持 mode=create 创建新文件 #1608.
• EN and ZH table / notes structures kept parallel to existing style (identical bullet count / ordering).

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 1608 - Fully compliant Compliant requirements: Mirror edits in EN + ZH filesystem API docs for the write() section Update section intro to mention mode="create" Extend mode parameter values to include create Add notes about mode semantics and create extension whitelist

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🏅 Score: 95

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ Recommended focus areas for review Documentation Inconsistency The uri parameter description still says "Existing file URI", which is incorrect for mode="create" where the file does not exist yet. | uri | str | Yes | - | Existing file URI | Documentation Inconsistency The uri parameter description still says "已存在文件的 URI", which is incorrect for mode="create" where the file does not exist yet. | uri | str | 是 | - | 已存在文件的 URI |

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