Feat: full optimization on connector dashboard (#14979)

### What problem does this PR solve?

This PR improves the connector dashboard task management experience and
adds better visibility into connector execution logs.

### Overview:

#### Before
<img width="700" alt="image"
src="https://github.com/user-attachments/assets/e4a8ed6f-2e18-4f0f-8528-41a514550052"
/>

#### Now:
<img width="700" alt="Screenshot from 2026-05-18 16-31-30"
src="https://github.com/user-attachments/assets/d4ca193b-847a-49ae-9e4f-5fbca60ea627"
/>

### 1. Add a new logging page to the connector dashboard

A new logging page has been added so users can view connector task
execution logs directly from the connector dashboard.

### 2. Merge the Resume button into Confirm

The separate **Resume** button has been removed. The **Confirm** button
now represents different actions depending on the current task state:

- **Save**: Save form changes and reschedule tasks.
- **Stop**: Cancel currently scheduled or running tasks.
- **Resume**: Create new scheduled tasks after the previous tasks have
been stopped.
- **Start**: Start tasks when no task has been started yet.

### 3. Separate syncing and pruning tasks

Connector tasks are now separated into **syncing** and **pruning**.

Pruning is controlled by the **Sync deleted files** option:

- When **Sync deleted files** is disabled, only syncing tasks are shown.
- When **Sync deleted files** is enabled, both syncing and pruning tasks
are shown.

**Now: Sync deleted files disabled**

<img width="700" alt="Sync deleted files disabled"
src="https://github.com/user-attachments/assets/dbd9232e-614a-407f-a0b1-c109e5fa567d"
/>

**Now: Sync deleted files enabled**

<img width="700" alt="Sync deleted files enabled"
src="https://github.com/user-attachments/assets/1f527f48-ccb3-4ee8-97ca-086891489296"
/>

### 4. Update logs in backend

<img width="700" alt="image"
src="https://github.com/user-attachments/assets/10a95a3f-98c1-4e67-8afa-ddf6cda5b0b2"
/>

### 5. Remove connector resume API

- Removed: `POST /v1/connectors/<connector_id>/resume`
- Replaced by: `PATCH /v1/connectors/<connector_id>`


### Type of change

- [x] New Feature (non-breaking change which adds functionality)

test/testcases/test_web_api/test_connector_app/test_connector_routes_unit.py

@@ -205,7 +205,7 @@ def _load_connector_app(monkeypatch):
             return True
 
         @staticmethod
-        def resume(*_args, **_kwargs):
+        def cancel_tasks(*_args, **_kwargs):
             return True
 
         @staticmethod
@@ -349,7 +349,7 @@ def test_connector_basic_routes_and_task_controls(monkeypatch):
     records = {"conn-1": _FakeConnectorRecord({"id": "conn-1", "source": "drive"})}
     update_calls = []
     save_calls = []
-    resume_calls = []
+    cancel_calls = []
     delete_calls = []
 
     monkeypatch.setattr(module.ConnectorService, "update_by_id", lambda cid, payload: update_calls.append((cid, payload)))
@@ -362,7 +362,7 @@ def test_connector_basic_routes_and_task_controls(monkeypatch):
     monkeypatch.setattr(module.ConnectorService, "get_by_id", lambda cid: (True, records[cid]))
     monkeypatch.setattr(module.ConnectorService, "list", lambda tenant_id: [{"id": "listed", "tenant": tenant_id}])
     monkeypatch.setattr(module.SyncLogsService, "list_sync_tasks", lambda cid, page, page_size: ([{"id": "log-1"}], 9))
-    monkeypatch.setattr(module.ConnectorService, "resume", lambda cid, status: resume_calls.append((cid, status)))
+    monkeypatch.setattr(module.ConnectorService, "cancel_tasks", lambda cid: cancel_calls.append(cid))
     monkeypatch.setattr(module.ConnectorService, "delete_by_id", lambda cid: delete_calls.append(cid))
     monkeypatch.setattr(module, "get_uuid", lambda: "generated-id")
 
@@ -401,14 +401,6 @@ def test_connector_basic_routes_and_task_controls(monkeypatch):
     logs_res = module.list_logs("conn-log")
     assert logs_res["data"] == {"total": 9, "logs": [{"id": "log-1"}]}
 
-    monkeypatch.setattr(module, "get_request_json", lambda: _AwaitableValue({"resume": True}))
-    assert _run(module.resume("conn-r1"))["data"] is True
-
-    monkeypatch.setattr(module, "get_request_json", lambda: _AwaitableValue({"resume": False}))
-    assert _run(module.resume("conn-r2"))["data"] is True
-    assert ("conn-r1", module.TaskStatus.SCHEDULE) in resume_calls
-    assert ("conn-r2", module.TaskStatus.CANCEL) in resume_calls
-
     monkeypatch.setattr(module, "get_request_json", lambda: _AwaitableValue({"kb_id": "kb-1"}))
     monkeypatch.setattr(module.ConnectorService, "rebuild", lambda *_args: "rebuild-failed")
     failed_rebuild = _run(module.rebuild("conn-rb"))
@@ -421,7 +413,7 @@ def test_connector_basic_routes_and_task_controls(monkeypatch):
 
     rm_res = module.rm_connector("conn-rm")
     assert rm_res["data"] is True
-    assert ("conn-rm", module.TaskStatus.CANCEL) in resume_calls
+    assert cancel_calls == ["conn-rm"]
     assert delete_calls == ["conn-rm"]
 
 
@@ -434,14 +426,14 @@ def test_connector_by_id_routes_reject_cross_tenant_access(monkeypatch):
     monkeypatch.setattr(module.ConnectorService, "accessible", lambda cid, uid: False)
     monkeypatch.setattr(module.ConnectorService, "get_by_id", lambda *_args: touched.append("get_by_id"))
     monkeypatch.setattr(module.SyncLogsService, "list_sync_tasks", lambda *_args: touched.append("list_sync_tasks"))
-    monkeypatch.setattr(module.ConnectorService, "resume", lambda *_args: touched.append("resume"))
+    monkeypatch.setattr(module.ConnectorService, "cancel_tasks", lambda *_args: touched.append("cancel_tasks"))
     monkeypatch.setattr(module.ConnectorService, "delete_by_id", lambda *_args: touched.append("delete_by_id"))
     monkeypatch.setattr(module.ConnectorService, "update_by_id", lambda *_args: touched.append("update_by_id"))
     monkeypatch.setattr(module.ConnectorService, "rebuild", lambda *_args: touched.append("rebuild"))
 
     def _get_request_json():
         touched.append("get_request_json")
-        return _AwaitableValue({"resume": True, "config": {"x": 1}})
+        return _AwaitableValue({"config": {"x": 1}})
 
     monkeypatch.setattr(module, "get_request_json", _get_request_json)
 
@@ -449,7 +441,6 @@ def test_connector_by_id_routes_reject_cross_tenant_access(monkeypatch):
         _run(module.update_connector("conn-victim")),
         module.get_connector("conn-victim"),
         module.list_logs("conn-victim"),
-        _run(module.resume("conn-victim")),
         _run(module.rebuild("conn-victim")),
         module.rm_connector("conn-victim"),
         _run(module.test_connector("conn-victim")),