chore(theme): astro 锁定 ~5.18.0（终审 Minor）+ docs: Plan 4 收官

Co-Authored-By: Claude Code <noreply@anthropic.com>

.deps_siteforge_v812/bleach/callbacks.py

@@ -0,0 +1,32 @@
+"""A set of basic callbacks for bleach.linkify."""
+
+
+def nofollow(attrs, new=False):
+    href_key = (None, "href")
+
+    if href_key not in attrs:
+        return attrs
+
+    if attrs[href_key].startswith("mailto:"):
+        return attrs
+
+    rel_key = (None, "rel")
+    rel_values = [val for val in attrs.get(rel_key, "").split(" ") if val]
+    if "nofollow" not in [rel_val.lower() for rel_val in rel_values]:
+        rel_values.append("nofollow")
+    attrs[rel_key] = " ".join(rel_values)
+
+    return attrs
+
+
+def target_blank(attrs, new=False):
+    href_key = (None, "href")
+
+    if href_key not in attrs:
+        return attrs
+
+    if attrs[href_key].startswith("mailto:"):
+        return attrs
+
+    attrs[(None, "target")] = "_blank"
+    return attrs