library: client modules end in -client, like protocols end in -protocol

display-client and input-client (files and module names), so a service,
its wire contract, and its client never share a name: `display` the
service, `display-protocol` the contract, `display-client` a program's
view of it. The nine consumers' imports and their packages' declared
lists follow (regenerated from the source scan); build-support's
module_homes table carries the new names.

system/drivers/usb-xhci-bus/build.zig

@@ -10,8 +10,9 @@ pub fn build(b: *std.Build) void {
         .name = "usb-xhci-bus",
         .root_source_file = b.path("usb-xhci-bus.zig"),
         .imports = &.{
-            "device-manager-protocol", "driver", "input", "ipc", "logging", "memory", "mmio",
-            "pci", "process", "service", "time", "usb-abi", "usb-ids", "usb-transfer-protocol",
+            "device-manager-protocol", "driver", "input-client", "ipc", "logging", "memory",
+            "mmio", "pci", "process", "service", "time", "usb-abi", "usb-ids",
+            "usb-transfer-protocol",
         },
     });
     b.installArtifact(exe);

system/drivers/usb-xhci-bus/usb-xhci-bus.zig

@@ -19,7 +19,7 @@ const ipc = @import("ipc");
 const process = @import("process");
 const service = @import("service");
 const time = @import("time");
-const input = @import("input");
+const input = @import("input-client");
 const device_manager = @import("driver");
 const memory = @import("memory");
 const logging = @import("logging");