feat(settings): per-model effort and turn presets

ClaudeDo never passed --effort, so every session inherited whatever effortLevel
the user's Claude Code config happened to carry. Settings -> General now holds one
row per model alias (haiku medium/20, sonnet high/30, opus high/40, fable high/25)
supplying the global effort and turn defaults; list- and task-level max-turns
overrides still win, and the agent editor's inherited badge follows the model.

--effort is applied to autonomous runs and to every ConPTY spec (task session,
planning start/resume, ad-hoc, list handler). The model itself is deliberately not
forced on interactive sessions. The single global 'Max turns' field is replaced by
the table, and 'fable' joins ModelRegistry.Aliases.

The migration also adds the is_manual columns used by the next commit.

src/ClaudeDo.Localization/locales/en.json

@@ -15,6 +15,9 @@
       "defaultInstructionsPlaceholder": "Baseline instructions applied to every task",
       "model": "Model",
       "maxTurns": "Max turns",
+      "effort": "Effort",
+      "modelPresets": "Per-model defaults",
+      "modelPresetsHint": "Reasoning effort and turn budget used when a session runs under that model. List- and task-level max-turn overrides still win.",
       "permission": "Permission",
       "maxParallelExecutions": "Max parallel executions",
       "maxParallelExecutionsHint": "How many queued tasks the worker runs at once.",