Phase 1: Windows log collection + full-text search

Extends the agent, ingest, storage, api, and web with Windows Event
Log/ETW sourcing and Tantivy-backed free-text search, per the approved
Phase 1 plan.

- CLAUDE.md: materialized on disk (never existed as a file before) with
  a new Phase 1 "done looks like" section.
- agent: Windows Event Log (EvtSubscribe) and ETW sources, Windows
  service wrapper (install/uninstall/run-service), both feature- and
  target_os-gated so Linux builds/tests/clippy stay unaffected. Also
  fixed two pre-existing Phase 0 clippy gaps (dead-code on
  default-features-only builds, a type-inference edge case) found while
  testing every feature combination properly for the first time.
  UNVERIFIED on real Windows -- no Windows toolchain existed anywhere in
  the build environment; flagged prominently in three places.
- proto/ingest: new record_id field, assigned once server-side in
  ingest's gRPC front end so ClickHouse and Tantivy agree on the same ID
  for the same record.
- storage: record_id column + bloom filter index, verified against a
  live ClickHouse.
- search: new service, Tantivy index, rskafka consumer as an independent
  second consumer group on the same Redpanda topic ingest already reads.
- api/web: new /search endpoint and page, sharing the query page's
  result-table shape and component.
- hack/windows-fixture: sends realistic Windows-shaped data straight to
  ingest, so the pipeline's handling of it is verifiable without a
  Windows host.

Verified end-to-end on the live docker-compose stack: the same record_id
comes back from both /query and /search for the same log line, including
for windows-fixture's synthetic Windows Event Log data. Real bugs found
and fixed along the way: api/Dockerfile missing proto/ in its build
context, search's logs being completely silent (RUST_LOG gap), and
search/target/ missing from .gitignore/.dockerignore.

web/src/routes/+layout.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import favicon from '$lib/assets/favicon.svg';
+	import { page } from '$app/state';
 
 	let { children } = $props();
 </script>
@@ -9,4 +10,32 @@
 	<link rel="icon" href={favicon} />
 </svelte:head>
 
+<nav>
+	<a href="/" class:active={page.url.pathname === '/'}>SQL Query</a>
+	<a href="/search" class:active={page.url.pathname === '/search'}>Full-Text Search</a>
+</nav>
+
 {@render children()}
+
+<style>
+	nav {
+		font-family: system-ui, sans-serif;
+		max-width: 960px;
+		margin: 1rem auto 0;
+		padding: 0 1rem;
+		display: flex;
+		gap: 1rem;
+		border-bottom: 1px solid #ccc;
+	}
+	nav a {
+		padding: 0.5rem 0;
+		text-decoration: none;
+		color: #555;
+		border-bottom: 2px solid transparent;
+	}
+	nav a.active {
+		color: #000;
+		border-bottom-color: #000;
+		font-weight: 600;
+	}
+</style>