feat(03-02): add get_project_by_name to project service

Add case-insensitive project lookup by name using ilike query.
Supports /project select command finding projects by name.

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

src/moai/core/services/project.py

@@ -55,3 +55,17 @@ async def get_project(project_id: str) -> Project | None:
     async with get_session() as session:
         result = await session.execute(select(Project).where(Project.id == project_id))
         return result.scalar_one_or_none()
+
+
+async def get_project_by_name(name: str) -> Project | None:
+    """Get a project by name (case-insensitive).
+
+    Args:
+        name: The project name to search for.
+
+    Returns:
+        The Project object if found, None otherwise.
+    """
+    async with get_session() as session:
+        result = await session.execute(select(Project).where(Project.name.ilike(name)))
+        return result.scalar_one_or_none()