fix: BugCollect.captureError 在 SDK 未初始化时不再崩溃

- captureError 检查 XuqmSDK.isInitialized() 再访问 appKey
- SDK 未初始化时将错误加入待处理队列，初始化后自动 flush
- captureCrash 也添加 isInitialized 检查

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

sdk-bugcollect/src/main/java/com/xuqm/sdk/bugcollect/BugCollect.kt

@@ -62,6 +62,34 @@ object BugCollect {
     }
 
     fun captureError(error: Throwable, tags: Map<String, Any?> = emptyMap(), fingerprint: String? = null) {
+        // SDK 未初始化时，将错误加入待处理队列
+        if (!XuqmSDK.isInitialized()) {
+            val event = IssueEvent(
+                level = "error",
+                platform = "android",
+                fingerprint = fingerprint ?: Fingerprint.compute(
+                    error.javaClass.simpleName,
+                    error.message ?: error.javaClass.name,
+                    error.stackTraceToString(),
+                ),
+                appKey = "pending",
+                exception = IssueEvent.ExceptionInfo(
+                    type = error.javaClass.simpleName,
+                    value = error.message ?: error.javaClass.name,
+                    stacktrace = error.stackTraceToString(),
+                ),
+                breadcrumbs = emptyList(),
+                release = appVersion(),
+                environment = environment,
+                userId = "unknown",
+                user = IssueEvent.UserInfo(id = "unknown"),
+                device = buildDeviceInfo(),
+                tags = tags,
+            )
+            synchronized(pendingErrorsLock) { pendingErrors.add(event) }
+            return
+        }
+
         val crumbs = synchronized(breadcrumbLock) { breadcrumbBuffer.toList() }
         val fp = fingerprint ?: Fingerprint.compute(
             error.javaClass.simpleName,
@@ -95,7 +123,8 @@ object BugCollect {
     }
 
     fun captureCrash(error: Throwable, tags: Map<String, Any?> = emptyMap()) {
-        if (!isReady()) return
+        // SDK 未初始化时直接返回，崩溃事件无法缓存
+        if (!XuqmSDK.isInitialized() || !isReady()) return
         val crumbs = synchronized(breadcrumbLock) { breadcrumbBuffer.toList() }
         queue().push(IssueEvent(
             level = "fatal",