feat: add threaded comments with polymorphic targets and slug-based routing

Introduce `load_comments` helper supporting polymorphic target types (post, project, bug) with nested parent-child threading. Refactor comment creation to use `target_type`/`target_uid` and `resolve_target_redirect` for correct redirects. Replace raw UID-based post/project routes with slug-aware resolution via `resolve_post`/`resolve_project` and `make_combined_slug`. Update SEO, sitemap, and FAB styling to use slugs and hardcoded red accent. Add reusable `_comment_section.html` template.

locustfile.py

@@ -15,6 +15,7 @@ SEED_USERS = []
 ALL_USERNAMES = []
 USER_UIDS = []
 POST_UIDS = []
+POST_SLUGS = []
 PROJECT_UIDS = []
 COMMENT_UIDS = []
 TOPICS = ["devlog", "showcase", "question", "rant", "fun", "random"]
@@ -105,9 +106,14 @@ def seed_data(environment, **kwargs):
                 urllib.request.Request(f"{host}/posts/create", data=body),
                 timeout=10,
             )
-            m = re.search(r"/posts/([a-f0-9-]+)", resp.url)
-            if m and m.group(1) not in POST_UIDS:
-                POST_UIDS.append(m.group(1))
+            m = re.search(r"/posts/(\S+)", resp.url)
+            if m and m.group(1) not in POST_SLUGS:
+                POST_SLUGS.append(m.group(1))
+            # extract full UUID from the response HTML
+            html = resp.read().decode("utf-8", errors="replace")
+            m2 = re.search(rf'name="post_uid"\s+value="({UUID_RE})"', html)
+            if m2 and m2.group(1) not in POST_UIDS:
+                POST_UIDS.append(m2.group(1))
         except Exception as e:
             logger.warning(f"Create seed post failed: {e}")
 
@@ -214,10 +220,11 @@ class DevPlaceUser(HttpUser):
 
     @task(4)
     def view_post(self):
-        if not POST_UIDS:
+        slugs = POST_SLUGS if POST_SLUGS else POST_UIDS
+        if not slugs:
             return
         self.client.get(
-            f"/posts/{random.choice(POST_UIDS)}", name="posts/[uid]"
+            f"/posts/{random.choice(slugs)}", name="posts/[uid]"
         )
 
     @task(3)
@@ -272,9 +279,12 @@ class DevPlaceUser(HttpUser):
                               catch_response=True,
                               name="posts/create") as resp:
             if resp.status_code == 200 and resp.history:
-                m = re.search(r"/posts/([a-f0-9-]+)", resp.url)
-                if m and m.group(1) not in POST_UIDS:
-                    POST_UIDS.append(m.group(1))
+                m = re.search(r"/posts/(\S+)", resp.url)
+                if m and m.group(1) not in POST_SLUGS:
+                    POST_SLUGS.append(m.group(1))
+                m2 = re.search(rf'name="post_uid"\s+value="({UUID_RE})"', resp.text)
+                if m2 and m2.group(1) not in POST_UIDS:
+                    POST_UIDS.append(m2.group(1))
                 resp.success()
             else:
                 resp.failure("post not created")