feat(telemetry-separation): dedicated /telemetry tab split from /events by adapter data_class (v0.7.4)

PR #5 of the v0.7.x GUI rework arc. Production code; central-gui restart only
(supervisor untouched -- data_class is read only by central-gui per request).

- SourceAdapter gains a `data_class` class attr (Literal["event","telemetry"],
  default "event"). NWIS opts in as "telemetry" (continuous high-volume water
  gauges); every other adapter stays "event". The /events vs /telemetry split is
  thus registry-derived from class attrs -- no hardcoded adapter-name lists.
- routes.py refactor: `_class_adapter_names(data_class)` and a `data_class` arg
  on `_adapter_filter_options` scope the flat + domain-grouped chip/legend lists
  to a class (colors stay keyed to the FULL registry, so an adapter keeps one
  color across tabs). `_fetch_events` accepts `class_adapters` and adds an
  `adapter = ANY(...)` condition. Shared `_events_query`, `_events_page(data_class,
  base_path)` and `_events_rows_fragment(...)` back both tabs; `/events`,
  `/events/rows`, `/telemetry`, `/telemetry/rows` are thin wrappers.
- Templates parameterized with a `base_path` context var (form action, hx-get,
  hx-push-url header, clear-all redirect, JS BASE_PATH const); the `_events_rows`
  paginator macro takes `base`. Same templates serve both tabs; nav gains a
  Telemetry link.
- /events.json UNCHANGED -- the cursor path sets no `class_adapters`, so the
  subject + pagination contract is intact (TestEventsJsonSubject still passes).

Adds TestTelemetrySeparation (data_class defaults, registry split 11 event / 1
telemetry, class-scoped filter options, color stability, and the `adapter =
ANY(...)` SQL shape incl. the no-class events.json path). Updates the events
frontend tests for the base_path-parameterized templates.

Full suite: 682 passed, 1 skipped (central and unprivileged zvx, 3x each).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_events_feed_frontend.py

@@ -710,6 +710,7 @@ def _events_context(events):
     return {
         "events": events,
         "next_cursor": None,
+        "base_path": "/events",
         "query_string": "",
         "pagination": {
             "total": n, "offset": 0, "limit": 50, "page": 1, "total_pages": 1,
@@ -781,13 +782,17 @@ class TestRegistryDrivenAdapterFilter:
 
         context = mock_templates.TemplateResponse.call_args.kwargs.get("context")
 
-        # The list is exactly the registry, sorted by name (stable), no extras.
-        assert [a["name"] for a in context["adapters"]] == sorted(registry.keys())
+        # v0.7.4: /events shows event-class adapters only (telemetry-class, e.g.
+        # nwis, moved to /telemetry). Registry-derived, sorted, no extras.
+        event_names = sorted(n for n, c in registry.items()
+                             if getattr(c, "data_class", "event") == "event")
+        assert [a["name"] for a in context["adapters"]] == event_names
         # Each entry carries name + display_name (v0.7.1 adds a positional color).
         by_name = {a["name"]: a for a in context["adapters"]}
-        for cls in registry.values():
-            assert by_name[cls.name]["display_name"] == cls.display_name
-            assert by_name[cls.name]["color"].startswith("#")
+        for name in event_names:
+            cls = registry[name]
+            assert by_name[name]["display_name"] == cls.display_name
+            assert by_name[name]["color"].startswith("#")
 
 
 class TestPerAdapterRowPartials: