Fix static folder path resolution for blueprints

Use absolute paths for templates and static folders to ensure
they resolve correctly regardless of the working directory.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/smarttools/web/__init__.py

@@ -1,11 +1,15 @@
 """Web UI blueprint for SmartTools."""
 
+import os
 from flask import Blueprint
 
+# Use absolute paths for templates and static folders
+_pkg_dir = os.path.dirname(os.path.abspath(__file__))
+
 web_bp = Blueprint(
     "web",
     __name__,
-    template_folder="templates",
-    static_folder="static",
+    template_folder=os.path.join(_pkg_dir, "templates"),
+    static_folder=os.path.join(_pkg_dir, "static"),
     static_url_path="/static",
 )