feat(db): mesh data model — meshes, members, invites, audit log

- pgSchema "mesh" with 4 tables isolating the peer mesh domain
- Enums: visibility, transport, tier, role
- audit_log is metadata-only (E2E encryption enforced at broker/client)
- Cascade on mesh delete, soft-delete via archivedAt/revokedAt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/lib/metadata.ts

@@ -0,0 +1,116 @@
+import { isKey } from "@turbostarter/i18n";
+import { getTranslation } from "@turbostarter/i18n/server";
+
+import { appConfig } from "~/config/app";
+
+import type { TranslationKey } from "@turbostarter/i18n";
+import type { Metadata, Viewport } from "next";
+
+type OpenGraphType =
+  | "article"
+  | "book"
+  | "music.song"
+  | "music.album"
+  | "music.playlist"
+  | "music.radio_station"
+  | "profile"
+  | "website"
+  | "video.tv_show"
+  | "video.other"
+  | "video.movie"
+  | "video.episode";
+
+interface SeoProps {
+  readonly title?: TranslationKey | (string & Record<never, never>);
+  readonly description?: TranslationKey | (string & Record<never, never>);
+  readonly image?: string;
+  readonly url?: string;
+  readonly canonical?: string;
+  readonly type?: OpenGraphType;
+  readonly images?: {
+    url: string;
+    width: number;
+    height: number;
+    alt?: string;
+  }[];
+}
+
+const SITE_NAME_SEPARATOR = " | ";
+export const SITE_NAME_TEMPLATE = `%s${SITE_NAME_SEPARATOR}${appConfig.name}`;
+
+const DEFAULT_IMAGE = {
+  url: `${appConfig.url}/opengraph-image.png`,
+  width: 1200,
+  height: 630,
+  alt: appConfig.name,
+};
+
+export const getMetadata =
+  (
+    {
+      title,
+      description = "common:product.description",
+      url,
+      canonical,
+      images = [DEFAULT_IMAGE],
+      type = "website",
+    } = {} as SeoProps,
+  ) =>
+  async ({
+    params,
+  }: {
+    params?: Promise<{ locale: string }>;
+  }): Promise<Metadata> => {
+    const { t, i18n } = await getTranslation({
+      locale: (await params)?.locale,
+    });
+
+    const common = {
+      ...(title && {
+        title: isKey(title, i18n) ? (t(title) as string) : title,
+      }),
+      description: isKey(description, i18n)
+        ? (t(description) as string)
+        : description,
+    };
+
+    return {
+      ...common,
+      openGraph: {
+        ...common,
+        url: url ?? canonical ?? appConfig.url,
+        siteName: appConfig.name,
+        type,
+        images,
+      },
+      ...{
+        ...(canonical && {
+          alternates: {
+            canonical,
+          },
+        }),
+      },
+      twitter: {
+        card: "summary_large_image" as const,
+        images,
+      },
+    };
+  };
+
+export const DEFAULT_METADATA: Metadata = {
+  ...(await getMetadata()({
+    params: Promise.resolve({ locale: appConfig.locale }),
+  })),
+  title: {
+    template: SITE_NAME_TEMPLATE,
+    default: appConfig.name,
+  },
+  metadataBase: appConfig.url ? new URL(appConfig.url) : null,
+};
+
+export const DEFAULT_VIEWPORT: Viewport = {
+  themeColor: [
+    { media: "(prefers-color-scheme: light)", color: "#ffffff" },
+    { media: "(prefers-color-scheme: dark)", color: "#030712" },
+  ],
+};