Add jinja2 explicit dependency for admin dashboard templates

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pyproject.toml

@@ -24,6 +24,7 @@ dependencies = [
     "sqlalchemy>=2.0.49",
     "asyncpg>=0.31.0",
     "redis>=7.4.0",
+    "jinja2>=3.1.0",
 ]
 
 [project.scripts]