Add passphrase keypasses

src/core/schemas.py

@@ -30,6 +30,9 @@ class KeypassCreate(BaseModel):
     expires_at: Optional[datetime] = None   # None = never expires
     gate_ids: list[int] = []                # empty = all gates
     code: Optional[str] = None              # None = auto-generate
+    # Auto-generation options (ignored when `code` is supplied manually)
+    length: int = 12                        # 6–32
+    charset: str = "alphanumeric"           # "alphanumeric" | "alpha" | "numeric" | "passphrase"
 
 
 class KeypassPatch(BaseModel):