Added the catalogue models and seed to support phase 5 of the POC prototype in the Persistence package.

Packages/Persistence/Sources/Internal/Seeds/Seed.swift

@@ -158,6 +158,20 @@ enum Seed {
         ),
     ]
 
+    /// The runs the demo listings belong to.
+    static let series: [Series] = [
+        .init(slug: "nightward", name: "Nightward", publisher: "Meridian Comics", years: "2019–2021", issueCount: 24,
+              blurb: "Two-year run, one printing for most issues. #1 has a second printing with a red logo; the hardcover collects #1–12."),
+        .init(slug: "ferrous-saint", name: "Ferrous Saint", publisher: "Blackline", years: "1993–1996", issueCount: 30,
+              blurb: "A nineties independent with direct and newsstand editions throughout. The omnibus collects the whole run."),
+        .init(slug: "echo-country", name: "Echo Country", publisher: "Harbour & Vale", years: "2021–2022", issueCount: 6,
+              blurb: "A six-issue limited series. Later printings carry recoloured covers."),
+        .init(slug: "vermilion-lake", name: "Vermilion Lake", publisher: "Meridian Comics", years: "1986–1989", issueCount: 18,
+              blurb: "Meridian's late-eighties flagship. #7 tells the origin of the Lake Warden."),
+        .init(slug: "paper-tigers", name: "Paper Tigers", publisher: "Cutwater Press", years: "2023–", issueCount: 4,
+              blurb: "Ongoing. Every issue ships with a 1:10 retailer variant."),
+    ]
+
     /// The demo shops.
     static let shops: [Shop] = [kestrelRow, thirdPanel, longbox, silverfish, inkwell]