Revert "feat(mazenet): per-LAN swarm host pin"

This reverts commit 0d92170a57.

decnet/web/db/models/topology.py

@@ -59,13 +59,6 @@ class LAN(SQLModel, table=True):
     docker_network_id: Optional[str] = Field(default=None)
     subnet: str
     is_dmz: bool = Field(default=False)
-    # Per-LAN swarm host pin. ``None`` means "fall back to
-    # ``Topology.target_host_uuid``; if that is also None, deploy on the
-    # master." A LAN is one Docker bridge — bridges don't span hosts —
-    # so a non-null value forces every decky in this LAN onto that host.
-    host_uuid: Optional[str] = Field(
-        default=None, foreign_key="swarm_hosts.uuid", index=True
-    )
     # Canvas layout coordinates (set by the web editor).  Nullable so
     # generator-emitted LANs don't need auto-layout at generation time.
     x: Optional[float] = Field(default=None)
@@ -232,7 +225,6 @@ class LANRow(BaseModel):
     subnet: str
     is_dmz: bool = False
     docker_network_id: Optional[str] = None
-    host_uuid: Optional[str] = None
     x: Optional[float] = None
     y: Optional[float] = None
 
@@ -288,7 +280,6 @@ class LANCreateRequest(BaseModel):
     name: str = PydanticField(..., min_length=1, max_length=64)
     subnet: Optional[str] = None
     is_dmz: bool = False
-    host_uuid: Optional[str] = None
     x: Optional[float] = None
     y: Optional[float] = None
     expected_version: Optional[int] = None
@@ -298,7 +289,6 @@ class LANUpdateRequest(BaseModel):
     name: Optional[str] = None
     subnet: Optional[str] = None
     is_dmz: Optional[bool] = None
-    host_uuid: Optional[str] = None
     x: Optional[float] = None
     y: Optional[float] = None
     expected_version: Optional[int] = None