feat(EMBEDDINGS-0001): enable local embedder by default and overhaul settings page

- Wire local embedding provider as the default on startup when no profile is configured
- Refactor embedding settings into dedicated service, DTOs, mappers and models
- Rebuild settings page with profile management UI and live test feedback
- Expose index summary (indexed versions + embedding count) on repo endpoints
- Harden indexing pipeline and context search with additional test coverage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/repos/[id]/+page.svelte

@@ -2,22 +2,24 @@
 	import { goto } from '$app/navigation';
 	import { resolve as resolveRoute } from '$app/paths';
 	import type { PageData } from './$types';
-	import type { Repository, RepositoryVersion, IndexingJob } from '$lib/types';
+	import type { Repository, IndexingJob } from '$lib/types';
 	import ConfirmDialog from '$lib/components/ConfirmDialog.svelte';
 	import IndexingProgress from '$lib/components/IndexingProgress.svelte';
 	import StatBadge from '$lib/components/StatBadge.svelte';
 
 	let { data }: { data: PageData } = $props();
 
-	// Initialized empty; $effect syncs from data prop on every navigation/reload.
-	let repo = $state<Repository & { versions?: RepositoryVersion[] }>(
-		{} as Repository & { versions?: RepositoryVersion[] }
+	let repoOverride = $state<
+		(Repository & { indexedVersions?: string[]; embeddingCount?: number }) | null
+	>(null);
+	const repo = $derived(
+		repoOverride ??
+			((data.repo ?? {}) as Repository & {
+				indexedVersions?: string[];
+				embeddingCount?: number;
+			})
 	);
-	let recentJobs = $state<IndexingJob[]>([]);
-	$effect(() => {
-		if (data.repo) repo = data.repo;
-		recentJobs = data.recentJobs ?? [];
-	});
+	const recentJobs = $derived((data.recentJobs ?? []) as IndexingJob[]);
 	let showDeleteConfirm = $state(false);
 	let activeJobId = $state<string | null>(null);
 	let errorMessage = $state<string | null>(null);
@@ -41,7 +43,7 @@
 		try {
 			const res = await fetch(`/api/v1/libs/${encodeURIComponent(repo.id)}`);
 			if (res.ok) {
-				repo = await res.json();
+				repoOverride = await res.json();
 			}
 		} catch {
 			// ignore
@@ -92,7 +94,8 @@
 		return new Date(ts as string).toLocaleString();
 	}
 
-	const versions = $derived(repo.versions ?? []);
+	const indexedVersions = $derived(repo.indexedVersions ?? []);
+	const embeddingCount = $derived(repo.embeddingCount ?? 0);
 	const totalSnippets = $derived(repo.totalSnippets ?? 0);
 	const totalTokens = $derived(repo.totalTokens ?? 0);
 	const trustScore = $derived(repo.trustScore ?? 0);
@@ -180,6 +183,7 @@
 <!-- Stats -->
 <div class="mt-6 grid grid-cols-2 gap-3 sm:grid-cols-4">
 	<StatBadge label="Snippets" value={totalSnippets.toLocaleString()} />
+	<StatBadge label="Embeddings" value={embeddingCount.toLocaleString()} />
 	<StatBadge label="Tokens" value={totalTokens.toLocaleString()} />
 	<StatBadge label="Trust Score" value="{trustScore.toFixed(1)}/10" />
 	{#if repo.stars != null}
@@ -210,31 +214,17 @@
 	</dl>
 </div>
 
-<!-- Versions -->
-{#if versions.length > 0}
+<!-- Indexed Versions -->
+{#if indexedVersions.length > 0}
 	<div class="mt-6 rounded-xl border border-gray-200 bg-white p-5">
 		<h2 class="mb-3 text-sm font-semibold text-gray-700">Indexed Versions</h2>
-		<div class="divide-y divide-gray-100">
-			{#each versions as version (version.id)}
-				<div class="flex items-center justify-between py-2.5">
-					<div>
-						<span class="font-mono text-sm font-medium text-gray-900">{version.tag}</span>
-						{#if version.title}
-							<span class="ml-2 text-sm text-gray-500">{version.title}</span>
-						{/if}
-					</div>
-					<div class="flex items-center gap-3">
-						<span
-							class="rounded-full px-2 py-0.5 text-xs {stateColors[version.state] ??
-								'bg-gray-100 text-gray-600'}"
-						>
-							{stateLabels[version.state] ?? version.state}
-						</span>
-						{#if version.indexedAt}
-							<span class="text-xs text-gray-400">{formatDate(version.indexedAt)}</span>
-						{/if}
-					</div>
-				</div>
+		<div class="flex flex-wrap gap-2">
+			{#each indexedVersions as versionTag (versionTag)}
+				<span
+					class="rounded-full border border-green-200 bg-green-50 px-3 py-1 font-mono text-sm text-green-800"
+				>
+					{versionTag}
+				</span>
 			{/each}
 		</div>
 	</div>