Fix: resolved sqlite concurrency errors (table users already exists) by moving DDL to explicit async initialize() and implementing lazy singleton dependency.

decnet/cli.py

@@ -305,16 +305,18 @@ def mutate(
     from decnet.mutator import mutate_decky, mutate_all, run_watch_loop
     from decnet.web.dependencies import repo
 
-    if watch:
-        asyncio.run(run_watch_loop(repo))
-        return
+    async def _run() -> None:
+        await repo.initialize()
+        if watch:
+            await run_watch_loop(repo)
+        elif decky_name:
+            await mutate_decky(decky_name, repo)
+        elif force_all:
+            await mutate_all(force=True, repo=repo)
+        else:
+            await mutate_all(force=False, repo=repo)
 
-    if decky_name:
-        asyncio.run(mutate_decky(decky_name, repo))
-    elif force_all:
-        asyncio.run(mutate_all(force=True, repo=repo))
-    else:
-        asyncio.run(mutate_all(force=False, repo=repo))
+    asyncio.run(_run())
 
 
 @app.command()