feat(server): integrate MCP queries and investigation messaging

Add project-bound OAuth MCP queries and controlled analysis with scoped evidence,
limits, timeouts and a nearby-model spatial query using EPSG:4326 inputs.
Default nearby searches to 200 meters and five results.

Integrate investigation messaging/presentation, health/readiness and typed history;
remove duplicate web search and fix online simulation and compressed baseline writes.
Include project migrations 023-025; keep local credentials and demo seeding excluded.

Validation: 319 focused pytest checks; real PostGIS temporary-table regression;
read-only Jinqian bridge radius comparison; cross-language MCP discovery/calls.

tests/unit/test_analysis_simulation.py

@@ -38,10 +38,10 @@ def test_valve_close_analysis_uses_normalized_scheme_type(monkeypatch):
     monkeypatch.setattr(
         simulation_scenarios.simulation,
         "run_simulation",
-        lambda **kwargs: captured.update(kwargs),
+        lambda **kwargs: (captured.update(kwargs), {"node_results": []})[1],
     )
 
-    simulation_scenarios.valve_close_analysis.__wrapped__(
+    saved_result = simulation_scenarios.valve_close_analysis.__wrapped__(
         name="demo",
         modify_pattern_start_time="2026-01-01T00:00:00+08:00",
         modify_valve_opening={"V1": 0.0},
@@ -51,6 +51,13 @@ def test_valve_close_analysis_uses_normalized_scheme_type(monkeypatch):
 
     assert captured["scheme_type"] == "valve_close_analysis"
     assert captured["result_db_name"] == "demo"
+    assert saved_result is None  # Preserve the existing REST "success" response.
+    preview = simulation_scenarios.valve_close_analysis.__wrapped__(
+        name="demo", modify_pattern_start_time="2026-01-01T00:00:00+08:00",
+        _temporary_project="tjw_tmp_demo", persist_results=False,
+    )
+    assert preview == {"node_results": []}
+    assert captured["persist_results"] is False
 
 
 def test_apply_valve_control_matches_runner_semantics(monkeypatch):
@@ -208,6 +215,32 @@ def test_extended_simulation_stores_results_by_run_id(monkeypatch):
     assert transaction_calls == [("begin", "demo"), ("end", "demo")]
     refresh_mock.assert_called_once_with("demo")
 
+    preview = simulation.run_simulation(
+        name="tjw_tmp_preview_test", simulation_type="extended",
+        modify_pattern_start_time="2026-07-16T00:00:00+08:00",
+        modify_total_duration=900, persist_results=False,
+        scada_mappings=_empty_scada_mappings(simulation),
+    )
+    assert preview["node_results"][0]["node"] == "J1"
+    assert len(storage_calls) == len(create_calls) == 1
+    assert len(lifecycle_calls) == 1
+    with pytest.raises(ValueError, match="isolated temporary model"):
+        simulation.run_simulation(name="demo", simulation_type="extended",
+            modify_pattern_start_time="2026-07-16T00:00:00+08:00", persist_results=False)
+
+    realtime_storage = Mock()
+    monkeypatch.setattr(simulation.TimescaleInternalStorage, "store_realtime_simulation", realtime_storage)
+    realtime = simulation.run_simulation(
+        name="demo", simulation_type="realtime",
+        modify_pattern_start_time="2026-07-16T00:00:00+08:00",
+        scada_mappings=_empty_scada_mappings(simulation),
+    )
+    realtime_storage.assert_called_once_with(
+        realtime["node_results"], realtime["link_results"],
+        "2026-07-16T00:00:00+08:00", db_name="demo",
+    )
+    assert len(storage_calls) == len(create_calls) == len(lifecycle_calls) == 1
+
 
 def test_extended_simulation_marks_run_failed_when_result_storage_fails(monkeypatch):
     from app.services import simulation