refactor(cli): remove logging.zig, consolidate into io.zig

Remove redundant logging.zig (28 lines):
- Functions moved to io.zig: printInfo, printSuccess, printWarning, printError, printProgress, confirm
- All functionality preserved with re-exports in utils.zig

Benefits:
- Reduced file count (22 → 21 utils)
- Single source of truth for I/O operations
- No functional changes

Build passes successfully.

cli/src/utils/io.zig

@@ -243,3 +243,48 @@ pub fn jsonGetBool(obj: std.json.ObjectMap, key: []const u8) ?bool {
     if (v != .bool) return null;
     return v.bool;
 }
+
+// ============================================================================
+// Logging Utilities (consolidated from logging.zig)
+// ============================================================================
+
+fn printWithColor(comptime color_code: []const u8, comptime format: []const u8, args: anytype) void {
+    const stderr = std.io.getStdErr().writer();
+    stderr.print(color_code ++ format ++ reset ++ "\n", args) catch {};
+}
+
+pub fn printInfo(comptime format: []const u8, args: anytype) void {
+    printWithColor(blue, format, args);
+}
+
+pub fn printSuccess(comptime format: []const u8, args: anytype) void {
+    printWithColor(green, format, args);
+}
+
+pub fn printWarning(comptime format: []const u8, args: anytype) void {
+    printWithColor(yellow, format, args);
+}
+
+pub fn printError(comptime format: []const u8, args: anytype) void {
+    printWithColor(red, format, args);
+}
+
+pub fn printProgress(comptime format: []const u8, args: anytype) void {
+    const stdout = std.io.getStdOut().writer();
+    stdout.print(format ++ "\n", args) catch {};
+}
+
+pub fn confirm(comptime prompt: []const u8, args: anytype) bool {
+    const stdin = std.io.getStdIn().reader();
+    const stdout = std.io.getStdOut().writer();
+
+    stdout.print(bold ++ prompt ++ reset ++ " [y/N] ", args) catch {};
+
+    var buf: [10]u8 = undefined;
+    if (stdin.readUntilDelimiterOrEof(&buf, '\n')) |input| {
+        if (input) |line| {
+            return line.len > 0 and (line[0] == 'y' or line[0] == 'Y');
+        }
+    } else |_| {}
+    return false;
+}

cli/src/utils/logging.zig

@@ -1,27 +0,0 @@
-const std = @import("std");
-const colors = @import("colors.zig");
-
-/// Simple logging utility that wraps colors functionality
-pub fn info(comptime format: []const u8, args: anytype) void {
-    colors.printInfo(format, args);
-}
-
-pub fn success(comptime format: []const u8, args: anytype) void {
-    colors.printSuccess(format, args);
-}
-
-pub fn warn(comptime format: []const u8, args: anytype) void {
-    colors.printWarning(format, args);
-}
-
-pub fn err(comptime format: []const u8, args: anytype) void {
-    colors.printError(format, args);
-}
-
-pub fn progress(comptime format: []const u8, args: anytype) void {
-    colors.printProgress(format, args);
-}
-
-pub fn confirm(comptime prompt: []const u8, args: anytype) bool {
-    return colors.confirm(prompt, args);
-}