feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

crates/git-credential-nostr/README.md

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+# git-credential-nostr
+
+NIP-98 credential helper for git — signs HTTP auth events with your Nostr key so git can push/pull from Buzz's git server without passwords.
+
+## Requirements
+
+- **git 2.46+** (requires `authtype` capability in the credential protocol)
+- **Rust toolchain** (for building from source)
+
+## Installation
+
+```bash
+cargo install --path crates/git-credential-nostr
+```
+
+## Setup
+
+```bash
+# 1. Register the helper and enable per-path credentials.
+git config --global credential.helper nostr
+git config --global credential.useHttpPath true
+
+# 2. Store your nsec in a key file (must be 0600).
+mkdir -p ~/.nostr
+echo "nsec1..." > ~/.nostr/key && chmod 600 ~/.nostr/key
+git config --global nostr.keyfile ~/.nostr/key
+```
+
+That's it. Use git normally — `git clone`, `git push`, `git fetch`.
+
+## CI / CD
+
+Set `$NOSTR_PRIVATE_KEY` instead of a key file. The env var takes precedence
+over `nostr.keyfile` and avoids touching the filesystem:
+
+```bash
+export NOSTR_PRIVATE_KEY=nsec1...
+git clone https://relay.example.com/git/owner/repo.git
+```
+
+## How It Works
+
+When a Buzz git server returns `HTTP 401` with a
+`WWW-Authenticate: Nostr realm="...", method="GET"` header, git calls this
+helper with the request details on stdin. The helper loads your Nostr private
+key, builds a [NIP-98](https://github.com/nostr-protocol/nips/blob/master/98.md)
+kind-27235 event signed over the request URL and method, base64-encodes it, and
+writes it back to stdout. Git then retries the request with
+`Authorization: Nostr <token>`, which the server verifies by checking the event
+signature.
+
+```
+git ──stdin──▶ git-credential-nostr ──stdout──▶ git
+                     │
+                     ▼
+              sign kind:27235 event
+              (NIP-98 HTTP Auth)
+```
+
+## Troubleshooting
+
+| Error | Cause | Fix |
+|-------|-------|-----|
+| `no nostr key configured` | Neither `$NOSTR_PRIVATE_KEY` nor `nostr.keyfile` is set | Follow the Setup steps above |
+| `insecure permissions` | Key file is readable by group/others | `chmod 600 ~/.nostr/key` |
+| `method hint` | Server's `WWW-Authenticate` header is missing `method="..."` | Upgrade the Buzz server |
+| `useHttpPath` | `credential.useHttpPath` is not set | `git config --global credential.useHttpPath true` |
+| Empty output / no auth | git version is older than 2.46 | Upgrade git |
+| `clock skew` / auth rejected | System clock is off by more than 60 s | Sync your system clock (`ntpdate`, `timedatectl`) |