feat(channel): structured tool-call IM display with edit-in-place

Introduce a new `show_tool_calls_in_im` bot setting plus a full overhaul of
how tool calls are surfaced in IM channels:

- Add per-bot setting + migration (0072) and expose through settings API /
  handlers / frontend SDK.
- Introduce a `toolCallDroppingStream` wrapper that filters tool_call_* events
  when the setting is off, keeping the rest of the stream intact.
- Add a shared `ToolCallPresentation` model (Header / Body blocks / Footer)
  with plain and Markdown renderers, and a per-tool formatter registry that
  produces rich output (e.g. `web_search` link lists, `list` directory
  previews, `exec` stdout/stderr tails) instead of raw JSON dumps.
- High-capability adapters (Telegram, Feishu, Matrix, Slack, Discord) now
  flush pre-text and then send ONE tool-call message per call, editing it
  in-place from `running` to `completed` / `failed`; mapping from callID to
  platform message ID is tracked per stream, with a fallback to a new
  message if the edit fails. Low-capability adapters (WeCom, QQ, DingTalk)
  keep posting a single final message, but now benefit from the same rich
  per-tool formatting.
- Suppress the early duplicate `EventToolCallStart` (from
  `sdk.ToolInputStartPart`) so that the SDK's final `StreamToolCallPart`
  remains the single source of truth for tool call start, preventing
  duplicated "running" bubbles in IM.
- Stop auto-populating `InputSummary` / `ResultSummary` after a per-tool
  formatter runs, which previously leaked the raw JSON result as a
  fallback footer underneath the formatted body.

Add regression tests for the formatters, the Markdown renderer, the
edit-in-place flow on Telegram/Matrix, and the JSON-leak guard on `list`.

internal/settings/types.go

@@ -29,6 +29,7 @@ type Settings struct {
 	CompactionModelID      string `json:"compaction_model_id,omitempty"`
 	DiscussProbeModelID    string `json:"discuss_probe_model_id,omitempty"`
 	PersistFullToolResults bool   `json:"persist_full_tool_results"`
+	ShowToolCallsInIM      bool   `json:"show_tool_calls_in_im"`
 }
 
 type UpsertRequest struct {
@@ -54,4 +55,5 @@ type UpsertRequest struct {
 	CompactionModelID      *string `json:"compaction_model_id,omitempty"`
 	DiscussProbeModelID    string  `json:"discuss_probe_model_id,omitempty"`
 	PersistFullToolResults *bool   `json:"persist_full_tool_results,omitempty"`
+	ShowToolCallsInIM      *bool   `json:"show_tool_calls_in_im,omitempty"`
 }