fix: Allow email addresses as Nextcloud admin username

The validation was too restrictive, only allowing alphanumeric usernames.
Now accepts both:
- Standard usernames (letters, numbers, underscores)
- Valid email addresses

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

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

.claude/settings.local.json

@@ -15,7 +15,11 @@
       "Bash(python:*)",
       "Bash(git init:*)",
       "Bash(git remote add:*)",
-      "Bash(git add:*)"
+      "Bash(git add:*)",
+      "Bash(git commit -m \"$(cat <<''EOF''\nInitial commit: LetsBe Cloud Orchestrator\n\nFeatures:\n- FastAPI backend with SQLAlchemy 2.0 async ORM\n- Tenant management (CRUD operations)\n- Task management with types: FILE_WRITE, ENV_UPDATE, DOCKER_RELOAD, COMPOSITE\n- Agent registration, heartbeat, and task claiming (/tasks/next)\n- Chatwoot deployment playbook (COMPOSITE task with ENV_UPDATE + DOCKER_RELOAD)\n- Alembic migrations for Postgres\n- Docker Compose setup for local development\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)\n\nCo-Authored-By: Claude <noreply@anthropic.com>\nEOF\n)\")",
+      "Bash(git push:*)",
+      "Bash(git remote set-url:*)",
+      "Bash(git commit:*)"
     ],
     "deny": [],
     "ask": []

app/routes/playbooks.py

@@ -68,10 +68,12 @@ class NextcloudInitialSetupRequest(BaseModel):
     @field_validator("admin_username")
     @classmethod
     def validate_username(cls, v: str) -> str:
-        """Validate that username is alphanumeric (with underscores allowed)."""
+        """Validate that username is alphanumeric or a valid email address."""
-        if not re.match(r"^[a-zA-Z][a-zA-Z0-9_]*$", v):
+        username_pattern = r"^[a-zA-Z][a-zA-Z0-9_]*$"
+        email_pattern = r"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$"
+        if not (re.match(username_pattern, v) or re.match(email_pattern, v)):
             raise ValueError(
-                "Username must start with a letter and contain only letters, numbers, and underscores"
+                "Username must be alphanumeric (starting with a letter) or a valid email address"
             )
         return v