feat: configure [backend] loads existing backend config rather than just overwriting it

1 files changed, 12 insertions, 20 deletions

diff --git a/app/backends/__init__.py b/app/backends/__init__.py
index 488c36e..3dff306 100644
--- a/app/backends/__init__.py
+++ b/app/backends/__init__.py
@@ -1,12 +1,12 @@
 """Registry of the TTS backends the audiobook generator can talk to.
 
 Each backend (audio.cpp, qwen, faster) lives in its own module and owns
-its setup wizard, its status detection, and the launch command it prints
-once configured. This package aggregates them into a single registry so
-``audiobook.py``'s TUI hub and future tools can iterate backends without
-hardcoding their names: ``backends.detect_all()`` reports which are set
+its setup wizard, its status detection, its uninstaller, and the launch
+command it prints once configured. This package aggregates them into a single
+registry so ``audiobook.py``'s TUI hub and future tools can iterate backends
+without hardcoding their names: ``backends.detect_all()`` reports which are set
 up (and whether their server is currently running), and the registry
-drives the hub's setup/configure menus.
+drives the hub's "Configure backends" menu.
 
 The registry is built lazily on the first call to ``get``/``detect_all``/
 ``detect`` (not at package import time), because the backend modules pull
@@ -17,9 +17,8 @@ importing this package must stay cheap and dependency-free.
 
 Adding a backend: create ``backends/<name>.py`` exposing
 ``detect() -> BackendStatus``, ``run_tui() -> int`` and
-``configure_actions: list[ConfigureAction]``, then append a ``BackendInfo`` in
-``_build_registry`` below. ``audiobook.py`` and the hub pick it up
-automatically.
+``uninstall() -> int``, then append a ``BackendInfo`` in ``_build_registry``
+below. ``audiobook.py`` and the hub pick it up automatically.
 """
 
 import shlex
@@ -131,20 +130,13 @@ def format_launch_hint(servers: List[ServerSpec]) -> str:
 
 
 @dataclass
-class ConfigureAction:
-    """A per-backend "configure" menu entry (e.g. "New server.json")."""
-    label: str
-    run: Callable[[], int]
-
-
-@dataclass
 class BackendInfo:
-    """One registry entry: identity, detector, setup wizard, configure menu."""
+    """One registry entry: identity, detector, setup wizard, uninstaller."""
     key: str
     label: str
     detect: Callable[[], BackendStatus]
     setup_tui: Callable[[], int]
-    configure_actions: List[ConfigureAction] = field(default_factory=list)
+    uninstall: Callable[[], int] = lambda: 0
 
 
 REGISTRY: List[BackendInfo] = []
@@ -162,21 +154,21 @@ def _build_registry() -> None:
         label="audio.cpp",
         detect=audiocpp.detect,
         setup_tui=audiocpp.run_tui,
-        configure_actions=audiocpp.configure_actions,
+        uninstall=audiocpp.uninstall,
     ))
     REGISTRY.append(BackendInfo(
         key="qwen",
         label="qwen-tts",
         detect=qwen.detect,
         setup_tui=qwen.run_tui,
-        configure_actions=qwen.configure_actions,
+        uninstall=qwen.uninstall,
     ))
     REGISTRY.append(BackendInfo(
         key="faster",
         label="faster-qwen3-tts",
         detect=faster.detect,
         setup_tui=faster.run_tui,
-        configure_actions=faster.configure_actions,
+        uninstall=faster.uninstall,
     ))
     for info in REGISTRY:
         _BY_KEY[info.key] = info