feat: ask ai (#936)

* feat: ask ai in ssh terminal
Fixes #934

* new(ask_ai): settings

* fix: app hot reload

* new: l10n

* chore: deps.

* opt.

lib/data/model/ai/ask_ai_models.dart

@@ -0,0 +1,74 @@
+import 'package:meta/meta.dart';
+
+/// Chat message exchanged with the Ask AI service.
+enum AskAiMessageRole { user, assistant }
+
+@immutable
+class AskAiMessage {
+  const AskAiMessage({
+    required this.role,
+    required this.content,
+  });
+
+  final AskAiMessageRole role;
+  final String content;
+
+  String get apiRole {
+    switch (role) {
+      case AskAiMessageRole.user:
+        return 'user';
+      case AskAiMessageRole.assistant:
+        return 'assistant';
+    }
+  }
+}
+
+/// Recommended command returned by the AI tool call.
+@immutable
+class AskAiCommand {
+  const AskAiCommand({
+    required this.command,
+    this.description = '',
+    this.toolName,
+  });
+
+  final String command;
+  final String description;
+  final String? toolName;
+}
+
+@immutable
+sealed class AskAiEvent {
+  const AskAiEvent();
+}
+
+/// Incremental text delta emitted while streaming the AI response.
+class AskAiContentDelta extends AskAiEvent {
+  const AskAiContentDelta(this.delta);
+  final String delta;
+}
+
+/// Emits when a tool call returns a runnable command suggestion.
+class AskAiToolSuggestion extends AskAiEvent {
+  const AskAiToolSuggestion(this.command);
+  final AskAiCommand command;
+}
+
+/// Signals that the stream finished successfully.
+class AskAiCompleted extends AskAiEvent {
+  const AskAiCompleted({
+    required this.fullText,
+    required this.commands,
+  });
+
+  final String fullText;
+  final List<AskAiCommand> commands;
+}
+
+/// Signals that the stream terminated with an error before completion.
+class AskAiStreamError extends AskAiEvent {
+  const AskAiStreamError(this.error, this.stackTrace);
+
+  final Object error;
+  final StackTrace? stackTrace;
+}