feat: list and route models through every configured provider

Metadata now resolves models.ini over provider defaults over presets.ini,
so a local model keeps getting its context and vision from the preset
while remaining overridable. A model whose vision support is unknown no
longer blocks an attachment: unknown is not the same as no, and the API
will reject an image if it really cannot take one.

Key resolution moves to the worker thread so a pass: key's pinentry
never freezes the GUI. KeyResolver gains a lock since StreamWorker and
TitleWorker can now overlap. Skipped providers surface in the status bar
rather than only on stderr. model_info uses dataclasses.replace to avoid
mutating the ModelInfo that resolve() may return from the store.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/test_llamachat.py b/test_llamachat.py
index 18b6f0a..98776b8 100755
--- a/test_llamachat.py
+++ b/test_llamachat.py
@@ -646,6 +646,7 @@ def test_sidebar_toggle():
 
     from llamachat import backend as _backend
     from llamachat import config as _config
+    from llamachat import models as _models
     from llamachat.ui import ChatWindow
 
     app = QApplication.instance() or QApplication([])
@@ -660,10 +661,11 @@ def test_sidebar_toggle():
         assert cfg.state_path.parent == Path(tmp), cfg.state_path
 
         history = db.History(cfg.db_path)
-        client = _backend.Client(cfg.base_url)
+        client = _backend.MultiClient(cfg.providers, cfg.request_timeout)
         presets = _config.parse_presets(cfg.presets_path)
+        store = _models.ModelStore(cfg.models_path)
 
-        window = ChatWindow(cfg, history, client, presets)
+        window = ChatWindow(cfg, history, client, presets, store)
         window.resize(1000, 700)
 
         # The shortcut must be registered on the window itself.
@@ -704,7 +706,7 @@ def test_sidebar_toggle():
         # Hidden state and width must come back on the next start.
         window.sidebar_button.setChecked(False)
         window._save_layout()
-        restored = ChatWindow(cfg, history, client, presets)
+        restored = ChatWindow(cfg, history, client, presets, store)
         assert not restored.sidebar_button.isChecked()
         assert restored.sidebar_width == 333, restored.sidebar_width
 
@@ -723,6 +725,7 @@ def test_shortcuts():
 
     from llamachat import backend as _backend
     from llamachat import config as _config
+    from llamachat import models as _models
     from llamachat.ui import ChatWindow
 
     app = QApplication.instance() or QApplication([])
@@ -735,8 +738,9 @@ def test_shortcuts():
         window = ChatWindow(
             cfg,
             history,
-            _backend.Client(cfg.base_url),
+            _backend.MultiClient(cfg.providers, cfg.request_timeout),
             _config.parse_presets(cfg.presets_path),
+            _models.ModelStore(cfg.models_path),
         )
         window.resize(1000, 700)
         window.show()