diff --git a/.gitea/scripts/ci_report.py b/.gitea/scripts/ci_report.py
index 16381b9..205f66b 100644
--- a/.gitea/scripts/ci_report.py
+++ b/.gitea/scripts/ci_report.py
@@ -182,6 +182,37 @@ def self_test() -> int:
         _, got, _ = verify(rep, expect, in_ci)
         if len(got) != want:
             problems.append(f"{name}：期望 {want} 个问题，实际 {len(got)} 个 {got}")
+    # 通知链接基址：优先 CI_PUBLIC_BASE_URL，缺/非法都必须**明确回退**（不猜、不静默）
+    env_backup = {k: os.environ.get(k) for k in ("CI_PUBLIC_BASE_URL", "GITHUB_SERVER_URL")}
+    try:
+        os.environ["GITHUB_SERVER_URL"] = "http://internal:3000"
+        os.environ.pop("CI_PUBLIC_BASE_URL", None)
+        b, src = _link_base()
+        if b != "http://internal:3000" or "GITHUB_SERVER_URL" not in src:
+            problems.append(f"没配 CI_PUBLIC_BASE_URL 时没回退到 GITHUB_SERVER_URL：{b!r}/{src!r}")
+        os.environ["CI_PUBLIC_BASE_URL"] = "https://gitea.zheromiku.top/"
+        b2, src2 = _link_base()
+        if b2 != "https://gitea.zheromiku.top" or src2 != "CI_PUBLIC_BASE_URL":
+            problems.append(f"配了 CI_PUBLIC_BASE_URL 没用它（或没去掉尾斜杠）：{b2!r}/{src2!r}")
+        for bad in ("gitea.zheromiku.top", "ftp://gitea.zheromiku.top",
+                    "https://u:p@gitea.zheromiku.top", "https://a b/"):
+            os.environ["CI_PUBLIC_BASE_URL"] = bad
+            b3, src3 = _link_base()
+            if b3 != "http://internal:3000" or "回退" not in src3:
+                problems.append(f"非法 CI_PUBLIC_BASE_URL({bad!r}) 没明确回退：{b3!r}/{src3!r}")
+        os.environ["CI_PUBLIC_BASE_URL"] = "https://gitea.zheromiku.top"
+        if _commit_url("a/b", "c" * 40, "https://gitea.zheromiku.top") != \
+                f"https://gitea.zheromiku.top/a/b/commit/{'c' * 40}":
+            problems.append("提交链接拼错")
+        for bad_repo, bad_sha in (("onlyone", "c" * 40), ("a/b", "c" * 12), ("a/b", "")):
+            if _commit_url(bad_repo, bad_sha, "https://gitea.zheromiku.top"):
+                problems.append(f"仓库/短 SHA 不合法却仍拼出链接：{bad_repo!r}/{bad_sha[:12]!r}")
+    finally:
+        for k2, v2 in env_backup.items():
+            if v2 is None:
+                os.environ.pop(k2, None)
+            else:
+                os.environ[k2] = v2
     if problems:
         print("❌ 上报核对自检失败：", file=sys.stderr)
         for p in problems:
@@ -228,9 +259,47 @@ def _scope_for_notify():
         return [], "", f"{e.__class__.__name__}"
 
 
-def _compare_url(repo: str) -> str:
+def _link_base() -> tuple:
+    """通知里的链接用哪个基址：**CI_PUBLIC_BASE_URL 优先**，没配/非法就退回 GITHUB_SERVER_URL。
+
+    只接受 `http(s)://host[:port][/path]` 的绝对地址、不接受带凭据（userinfo）的写法。
+    返回 (base, source)；source 会写进上报与 CI 日志，方便事后核对"这条链接是谁给的基址"。
+
+    ⚠️ 这是**唯一的**链接基址来源：不做"把消息文本里的 URL 全部替换一遍"那种事 ——
+    那样会把提交标题、日志摘要里的 URL 也改掉（那些是事实，不许动）。
+    """
+    pub = (os.environ.get("CI_PUBLIC_BASE_URL") or "").strip()
+    fallback = (os.environ.get("GITHUB_SERVER_URL") or "").strip().rstrip("/")
+    if pub:
+        bad = None
+        if not re.match(r"^https?://", pub):
+            bad = "不是 http(s) 绝对地址"
+        elif "	" in pub or " " in pub:
+            bad = "含空白字符"
+        else:
+            m = re.match(r"^[a-z]+://([^/]+)", pub, re.I)
+            if not m or "@" in m.group(1):
+                bad = "主机部分不合法或带凭据（userinfo）"
+        if bad:
+            return fallback, f"CI_PUBLIC_BASE_URL 非法（{bad}）⇒ 回退 GITHUB_SERVER_URL"
+        return pub.rstrip("/"), "CI_PUBLIC_BASE_URL"
+    return fallback, "GITHUB_SERVER_URL（未配 CI_PUBLIC_BASE_URL）"
+
+
+def _repo_ok(repo: str) -> bool:
+    """链接里的仓库必须是真的 owner/repo（两段、都非空），否则宁可不给链接。"""
+    parts = [x for x in str(repo or "").split("/")]
+    return len(parts) == 2 and all(x.strip() for x in parts)
+
+
+def _commit_url(repo: str, sha: str, base: str) -> str:
+    if not _repo_ok(repo) or not base or not re.match(r"^[0-9a-f]{40}$", str(sha or "")):
+        return ""
+    return f"{base}/{repo}/commit/{sha}"
+
+
+def _compare_url(repo: str, base: str) -> str:
     """变更列表链接：只有拿到真实的 before/after 才给（不然就是编一个打不开的地址）。"""
-    base = (os.environ.get("GITHUB_SERVER_URL") or "").rstrip("/")
     ev = (os.environ.get("GITHUB_EVENT_PATH") or "").strip()
     if not base or not repo or not ev or not os.path.exists(ev):
         return ""
@@ -351,6 +420,15 @@ def main(argv: list[str]) -> int:
     if problems:
         print("❌ 汇总不可信/不完整 ⇒ 不能报绿（作业这次不算通过）", file=sys.stderr)
 
+    _lb_base, _lb_source = _link_base()
+    repo_full = (rep.get("repository") or os.environ.get("GITHUB_REPOSITORY") or "").strip()
+    if _lb_source != "CI_PUBLIC_BASE_URL":
+        print(f"提示：通知链接基址 = {_lb_base or '（未取得）'}（{_lb_source}）", flush=True)
+    else:
+        print(f"通知链接基址 = {_lb_base}（来自 CI_PUBLIC_BASE_URL）", flush=True)
+    if not _repo_ok(repo_full):
+        print(f"⚠️  仓库名不是 owner/repo（{repo_full[:40]!r}）⇒ 通知里不给 run/提交/变更 链接",
+              file=sys.stderr)
     _scope_commits, _scope_source, _scope_err = _scope_for_notify()
     _scope_payload = {"commits": _scope_commits, "source": _scope_source,
                       "count": len(_scope_commits)}
@@ -384,9 +462,8 @@ def main(argv: list[str]) -> int:
         "event": rep.get("event"),
         "run_mode": rep.get("run_mode"),
         "run_id": os.environ.get("GITHUB_RUN_ID", ""),
-        "run_url": (f"{os.environ.get('GITHUB_SERVER_URL', '')}/"
-                    f"{rep.get('repository', '')}/actions/runs/{os.environ.get('GITHUB_RUN_ID', '')}"
-                    if os.environ.get("GITHUB_RUN_ID") else ""),
+        "run_url": (f"{_lb_base}/{repo_full}/actions/runs/{os.environ.get('GITHUB_RUN_ID', '')}"
+                    if (os.environ.get("GITHUB_RUN_ID") and _lb_base and _repo_ok(repo_full)) else ""),
         "checks": checks,
         "manifest": rep.get("manifest"),
         "problems": (rep.get("problems") or []) + problems,
@@ -403,7 +480,10 @@ def main(argv: list[str]) -> int:
         "commits": _scope_payload["commits"],     # 准确范围里的提交标题（≤10 条）
         "range_source": _scope_payload["source"],  # 范围是怎么算出来的（可复盘）
         "commit_count": (_scope_payload["count"] or payload_count),   # 条数由 Git 算
-        "compare_url": _compare_url(rep.get("repository", "")),
+        "compare_url": _compare_url(repo_full, _lb_base),
+        "commit_url": _commit_url(repo_full, rep.get("commit_sha") or "", _lb_base),
+        "link_base": _lb_base,                  # 链接基址（可复盘）
+        "link_base_source": _lb_source,         # 基址从哪来：CI_PUBLIC_BASE_URL / GITHUB_SERVER_URL 回退
         "run_duration_s": "",                     # 整次运行耗时：本 workflow 没留起点 ⇒ 不编
         "duration_kind": "gate",
         "first_failure": _first_failure(checks),
@@ -438,4 +518,4 @@ def main(argv: list[str]) -> int:
 
 
 if __name__ == "__main__":
-    raise SystemExit(main(sys.argv[1:]))
\ No newline at end of file
+    raise SystemExit(main(sys.argv[1:]))
diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 5d4c183..7ddcb47 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -177,6 +177,11 @@ jobs:
         env:
           BRIDGE_URL: ${{ vars.CI_BRIDGE_URL }}
           BRIDGE_TOKEN: ${{ secrets.CI_BRIDGE_TOKEN }}
+          # 通知里的链接基址（**非秘密**，直接写在 workflow 里便于审查与复盘）：
+          #   CI 运行 / 提交 / 变更 三类链接统一用它拼；提交与变更里的仓库、SHA、run_id 仍是真实值。
+          #   **不覆盖 GITHUB_SERVER_URL**（检出与所有内部调用继续用它，检出地址一个字节没变）。
+          #   删掉这一行 ⇒ ci_report.py 明确回退到 GITHUB_SERVER_URL，并在上报里写 link_base_source。
+          CI_PUBLIC_BASE_URL: https://gitea.zheromiku.top
         run: |
           set +e; set +o pipefail
           B="${BRIDGE_URL:-}"