docs(tasks): remove completed Task 22 setup flow test issue

Make master_password_hash optional in development config

None default allows env var to override. Hardcoded dev hash removed.

src/server/config/development.py

@@ -38,12 +38,11 @@ class DevelopmentSettings(BaseSettings):
     )
     """Password salt (non-production value for development)."""
 
-    master_password_hash: str = Field(
-        default="$2b$12$wP0KBVbJKVAb8CdSSXw0NeGTKCk"
-        "bw4fSAFXIqR2/wDqPSEBn9w7lS",
+    master_password_hash: Optional[str] = Field(
+        default=None,
         env="MASTER_PASSWORD_HASH"
     )
-    """Hash of the master password (dev: 'password')."""
+    """Hash of the master password. None means not configured (env var overrides)."""
 
     master_password: str = Field(default="password", env="MASTER_PASSWORD")
     """Master password for development (NEVER use in production)."""