fix: remove duplicate projects from dashboard

Gitea's /api/v1/user/repos already includes all org repos the user
has access to. Fetching org repos separately added duplicates.
Removed the redundant org-repo loop from dashboard and /api/projects.
Also fixed template to use repo.owner.login instead of _org hack.

app/routers/api.py

@@ -82,15 +82,6 @@ async def projects(search: str = Query(default=""), show_archived: bool = Query(
     """List Gitea projects (JSON)."""
     try:
         repos = await gitea.get_user_repos(page=1, limit=50)
-        orgs = await gitea.get_user_orgs()
-        for org in orgs:
-            try:
-                org_repos = await gitea.get_org_repos(org["username"])
-                for r in org_repos:
-                    r["_org"] = org["username"]
-                repos.extend(org_repos)
-            except Exception:
-                pass
         if search:
             q = search.lower()
             repos = [r for r in repos if q in r.get("full_name", "").lower() or q in (r.get("description") or "").lower()]