Extract shortened URLs to /s/ path

This exact feature is not quite popular,
so it's better to do it earlier as possible.
This will solve problems with indexing by search engines,
problems with paths, etc.

futuramaapi/routers/root/api.py

@@ -157,7 +157,7 @@ async def robots():
 
 
 @router.get(
-    "/{shortened}",
+    "/s/{shortened}",
     include_in_schema=False,
     name="user_link_redirect",
 )

futuramaapi/routers/users/schemas.py

@@ -295,16 +295,17 @@ class Link(BaseModel, BaseModelDatabaseMixin):
     )
     created_at: datetime
     counter: int
+    path_prefix: ClassVar[str] = "s"
 
     @computed_field(  # type: ignore[misc]
         examples=[
-            settings.build_url(path="LWlWthH", is_static=False).unicode_string(),
+            settings.build_url(path=f"{path_prefix}/LWlWthH", is_static=False).unicode_string(),
         ],
         return_type=str,
     )
     @property
     def shortened_url(self) -> str:
-        return settings.build_url(path=self.shortened, is_static=False).unicode_string()
+        return settings.build_url(path=f"{self.path_prefix}/{self.shortened}", is_static=False).unicode_string()
 
     @classmethod
     async def create(

robots.txt

@@ -1,11 +1,14 @@
 User-agent: *
 Disallow: /api/
+Disallow: /s/
 Allow: /
 
 User-agent: Googlebot
 Disallow: /api/
+Disallow: /s/
 Allow: /
 
 User-agent: Yandex
 Disallow: /api/
+Disallow: /s/
 Allow: /