fix(provider): distinguish legacy providers from db-only when tolerating live config errors

Change `ProviderMeta.live_config_managed` from `bool` to `Option<bool>`
to introduce a three-state semantic:
- `Some(true)`: provider has been written to live config
- `Some(false)`: explicitly db-only, never written to live config
- `None`: legacy data or unknown state (pre-existing providers)

Previously, legacy providers defaulted to `live_config_managed = false`
via `#[serde(default)]`, which silently swallowed live config parse
errors. This could mask genuine configuration issues for providers that
had actually been synced to live config before the field was introduced.

Now, only providers with an explicit `Some(false)` marker tolerate parse
errors; legacy `None` providers surface errors as before, preserving
safety for already-managed configurations.

Also wrap the `ensureQueryData` call for live provider IDs during
duplication in a try/catch so that a malformed config file shows a
user-facing toast instead of silently failing.

Add tests for both the legacy error propagation path and the frontend
duplication failure scenario.

src/App.tsx

@@ -615,16 +615,31 @@ function App() {
     };
 
     if (activeApp === "opencode" || activeApp === "openclaw") {
-      const liveProviderIds =
-        activeApp === "opencode"
-          ? await queryClient.ensureQueryData({
-              queryKey: ["opencodeLiveProviderIds"],
-              queryFn: () => providersApi.getOpenCodeLiveProviderIds(),
-            })
-          : await queryClient.ensureQueryData({
-              queryKey: openclawKeys.liveProviderIds,
-              queryFn: () => providersApi.getOpenClawLiveProviderIds(),
-            });
+      let liveProviderIds: string[] = [];
+      try {
+        liveProviderIds =
+          activeApp === "opencode"
+            ? await queryClient.ensureQueryData({
+                queryKey: ["opencodeLiveProviderIds"],
+                queryFn: () => providersApi.getOpenCodeLiveProviderIds(),
+              })
+            : await queryClient.ensureQueryData({
+                queryKey: openclawKeys.liveProviderIds,
+                queryFn: () => providersApi.getOpenClawLiveProviderIds(),
+              });
+      } catch (error) {
+        console.error(
+          "[App] Failed to load live provider IDs for duplication",
+          error,
+        );
+        const errorMessage = extractErrorMessage(error);
+        toast.error(
+          t("provider.duplicateLiveIdsLoadFailed", {
+            defaultValue: "读取配置中的供应商标识失败，请先修复配置后再试",
+          }) + (errorMessage ? `: ${errorMessage}` : ""),
+        );
+        return;
+      }
       const existingKeys = Array.from(
         new Set([...Object.keys(providers), ...liveProviderIds]),
       );