fix: resolve subcategory slugs in category lookup and listing

The /categories.json endpoint only returns top-level categories by
default, so subcategory slugs (e.g. vp-techops) failed to resolve and
the 'categories' listing hid the entire subcategory tree. Both
_resolve_category and cmd_categories now pass include_subcategories=true
and traverse the nested subcategory_list.

discourse-cli/src/discourse_cli.py

@@ -121,17 +121,22 @@ def cmd_whoami(args):
 
 def cmd_categories(args):
     api = _client()
-    data = api.get("/categories.json")
+    data = api.get("/categories.json", params={"include_subcategories": "true"})
     cats = data.get("category_list", {}).get("categories", [])
-    print(f"{'ID':<6} {'SLUG':<28} {'TOPICS':>7}  NAME")
-    print("-" * 80)
+    print(f"{'ID':<6} {'SLUG':<36} {'TOPICS':>7}  NAME")
+    print("-" * 90)
+    count = 0
     for c in cats:
         topic_count = c.get("topic_count", 0)
-        print(f"{c.get('id','?'):<6} {str(c.get('slug','')):<28} {topic_count:>6}  {c.get('name','')}")
-    subcats = []
-    for c in cats:
-        subcats.extend(c.get("subcategory_ids", []) or [])
-    print(f"\n{len(cats)} category(ies)")
+        print(f"{c.get('id','?'):<6} {str(c.get('slug','')):<36} {topic_count:>6}  {c.get('name','')}")
+        count += 1
+        for s in c.get("subcategory_list") or []:
+            sub_count = s.get("topic_count", 0)
+            slug = "  " + str(s.get("slug", ""))
+            name = "  " + s.get("name", "")
+            print(f"{s.get('id','?'):<6} {slug:<36} {sub_count:>6}  {name}")
+            count += 1
+    print(f"\n{count} category(ies)")
     return 0
 
 
@@ -314,7 +319,7 @@ def _resolve_category(api, ref):
     """Resolve a category id, slug, or name to a numeric id."""
     if str(ref).isdigit():
         return int(ref)
-    data = api.get("/categories.json")
+    data = api.get("/categories.json", params={"include_subcategories": "true"})
     cats = data.get("category_list", {}).get("categories", [])
     needle = str(ref).strip().lower()
     for c in cats:
@@ -322,6 +327,11 @@ def _resolve_category(api, ref):
             return c["id"]
         if str(c.get("name", "")).lower() == needle:
             return c["id"]
+        for s in c.get("subcategory_list") or []:
+            if str(s.get("slug", "")).lower() == needle:
+                return s["id"]
+            if str(s.get("name", "")).lower() == needle:
+                return s["id"]
     _err(f"unknown category '{ref}'. Run 'categories' to list valid slugs/names.")