refactor(cli): remove remaining deprecated imports

Update remaining files using deprecated imports:
- core/output.zig: terminal.zig → io.zig
- net/ws/deps.zig: remove colors.zig export (available via io)

All tests pass.

cli/src/core/output.zig

@@ -1,5 +1,5 @@
 const std = @import("std");
-const terminal = @import("../utils/terminal.zig");
+const io = @import("../utils/io.zig");
 
 /// Output mode: JSON for structured data, text for TSV
 pub const Mode = enum { json, text };
@@ -133,5 +133,5 @@ pub fn value(v: []const u8) void {
 
 /// Get terminal width for formatting
 pub fn getTerminalWidth() ?usize {
-    return terminal.getWidth();
+    return io.getWidth();
 }

cli/src/net/ws/deps.zig

@@ -1,6 +1,5 @@
 pub const std = @import("std");
 
-pub const colors = @import("../../utils/colors.zig");
 pub const crypto = @import("../../utils/crypto.zig");
 pub const io = @import("../../utils/io.zig");
 pub const log = io;