fix(deploy): add pre-flight validation before deployment

Validate that pyproject.toml, a lockfile (uv.lock or poetry.lock),
and the expected src/<project>/crew.py or config directory exist
locally before making any API calls. This surfaces clear, actionable
errors on the CLI instead of cryptic server-side deployment failures.

lib/cli/src/crewai_cli/deploy/main.py

@@ -1,3 +1,4 @@
+from pathlib import Path
 from typing import Any
 
 from rich.console import Console
@@ -23,6 +24,41 @@ class DeployCommand(BaseCommand, PlusAPIMixin):
         BaseCommand.__init__(self)
         PlusAPIMixin.__init__(self)
         self.project_name = get_project_name(require=True)
+        self._validate_project_structure()
+
+    def _validate_project_structure(self) -> None:
+        """Validate that the local project has the files required for deployment."""
+        errors: list[str] = []
+
+        if not Path("pyproject.toml").exists():
+            errors.append("Cannot find pyproject.toml in the current directory.")
+
+        has_lockfile = Path("uv.lock").exists() or Path("poetry.lock").exists()
+        if not has_lockfile:
+            errors.append(
+                "No uv.lock or poetry.lock found. "
+                "Run 'uv lock' or 'poetry lock' to generate one."
+            )
+
+        src_dir = Path("src") / (self.project_name or "")
+        crew_py = src_dir / "crew.py"
+        config_dir = src_dir / "config"
+        if not crew_py.exists() and not config_dir.exists():
+            errors.append(
+                f"Cannot find src/{self.project_name}/crew.py or "
+                f"src/{self.project_name}/config. "
+                "Ensure you are running this command from the project root."
+            )
+
+        if errors:
+            console.print(
+                "\n[bold red]Pre-flight check failed:[/bold red] "
+                "Your project is missing required files for deployment.\n"
+            )
+            for error in errors:
+                console.print(f"  • {error}", style="red")
+            console.print()
+            raise SystemExit(1)
 
     def _standard_no_param_error_message(self) -> None:
         """