feat(PORT-004A): add workspace bootstrap and scoped settings

app/models/portfolio.py

@@ -222,12 +222,13 @@ class PortfolioRepository:
 
     CONFIG_PATH = Path("data/portfolio_config.json")
 
-    def __init__(self) -> None:
-        self.CONFIG_PATH.parent.mkdir(parents=True, exist_ok=True)
+    def __init__(self, config_path: Path | None = None) -> None:
+        self.config_path = config_path or self.CONFIG_PATH
+        self.config_path.parent.mkdir(parents=True, exist_ok=True)
 
     def save(self, config: PortfolioConfig) -> None:
         """Save configuration to disk."""
-        with open(self.CONFIG_PATH, "w") as f:
+        with open(self.config_path, "w") as f:
             json.dump(config.to_dict(), f, indent=2)
 
     def load(self) -> PortfolioConfig:
@@ -235,13 +236,13 @@ class PortfolioRepository:
 
         Returns default configuration if file doesn't exist.
         """
-        if not self.CONFIG_PATH.exists():
+        if not self.config_path.exists():
             default = PortfolioConfig()
             self.save(default)
             return default
 
         try:
-            with open(self.CONFIG_PATH) as f:
+            with open(self.config_path) as f:
                 data = json.load(f)
             return PortfolioConfig.from_dict(data)
         except (json.JSONDecodeError, ValueError) as e: