fix: unused TextModelArch import when luxtts feature is disabled

[SAGAR-TAMANG]

Problem

TextModelArch is imported unconditionally in cake-cli/src/main.rs:10, but its only use site is inside a #[cfg(feature = "luxtts")] block in run_master (cake-cli/src/main.rs:321). Building the CLI without that feature warns:

warning: unused import: `TextModelArch`
  --> cake-cli/src/main.rs:10:45
   |
10 |     utils, Args, ImageModelArch, ModelType, TextModelArch,
   |                                             ^^^^^^^^^^^^^

Reproduce:

cargo build --release -p cake-cli --no-default-features \
  --features "master,llama,qwen2,qwen3"

This breaks the zero-warning clippy requirement in CLAUDE.md for any reduced-feature build of the CLI.

Why it went unnoticed

luxtts is in the default feature set, so the import is always used in a normal build. And no CI job builds cake-cli with --no-default-features:

• the clippy job (ci.yml:294) lints cake-cli with default features plus vulkan,rocm
• the test-android job builds with reduced features, but only targets cake-core and cake-mobile — never the CLI
• the same is true of test-ios

Fix

Drop the import and fully qualify the path at the use site, matching the adjacent cake_core::dispatch_text_model! call:

-    utils, Args, ImageModelArch, ModelType, TextModelArch,
+    utils, Args, ImageModelArch, ModelType,

     #[cfg(feature = "luxtts")]
-    if ctx.text_model_arch == TextModelArch::LuxTTS {
+    if ctx.text_model_arch == cake_core::TextModelArch::LuxTTS {

This stays valid under every feature combination and avoids adding a second #[cfg] attribute that would have to be kept in sync with the one at the use site.

Verification

Relying on the existing clippy job to confirm the default-feature build is unaffected, since removing an import is the direction that could regress. Not yet built locally with the full default feature set.

Context

Found while building for Termux/Android on-device, where a reduced feature set is necessary to keep compile time and memory usage in range.

Happy to follow up with a CI step that covers this configuration so it can't regress:

- name: Clippy (cake-cli, minimal features)
  run: cargo clippy -p cake-cli --no-default-features --features "master,llama,qwen2,qwen3" -- -D warnings

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