Initial MVP: drivable RX-7 vertical slice + server-authoritative systems

- Rojo + Wally project; ProfileStore (loleris) for safe saves
- Shared: GameConfig, Cars (RX-7 free starter), ProfileTemplate, Remotes
- Server: DataManager, Economy, CarManager, RaceManager, MapBuilder, AntiCheat
- Client: neon HUD + Garage/Dealership UI (buy/equip/upgrade), race/daily
- Procedural Tokyo expressway (spawn pad, finish line, neon pylons, kill walls)
- CI workflow (Gitea/GitHub), Makefile, selene+stylua clean, rojo builds
- Docs: README, GDD, realistic solo ROADMAP

src/shared/Cars.luau

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+--!strict
+--[[
+	Cars.luau
+	The car catalogue. Table-driven so adding a car = adding a row.
+	MVP ships with the RX-7 starter + a few tier examples so the dealership
+	and progression have something to show. Expand freely later.
+
+	Stat scale: 0-100 (relative feel, not real units). Speed maps to top speed,
+	Acceleration to how fast it gets there, Handling to grip/turn-in.
+	Price is in cash. RepRequired gates purchase behind reputation.
+]]
+
+export type CarStats = {
+	Speed: number,
+	Acceleration: number,
+	Handling: number,
+}
+
+export type Car = {
+	Id: string,
+	Name: string,
+	Model: string, -- real-world reference
+	Tier: number, -- 1 Junk .. 5 Exotic
+	Price: number,
+	RepRequired: number,
+	Stats: CarStats,
+	Color: { number }, -- {r,g,b} 0-1 for the placeholder body until real mesh exists
+	Description: string,
+	Starter: boolean?, -- true = granted free on first join
+}
+
+local Cars = {}
+
+-- Ordered list (dealership browses this in order) ---------------------------
+Cars.List = {
+	{
+		Id = "rx7_fc",
+		Name = "Chick3n's RX-7",
+		Model = "1993 Mazda RX-7 (FD)",
+		Tier = 2,
+		Price = 0,
+		RepRequired = 0,
+		Stats = { Speed = 62, Acceleration = 58, Handling = 70 },
+		Color = { 0.85, 0.15, 0.12 }, -- classic RX-7 red until the real mesh is imported
+		Description = "The one that started it all. A rotary-hearted FD RX-7 — light, balanced, and iconic. Your daily driver and first weapon on the expressway.",
+		Starter = true,
+	},
+	{
+		Id = "hatch_junk",
+		Name = "City Runabout",
+		Model = "90s econobox hatchback",
+		Tier = 1,
+		Price = 800,
+		RepRequired = 0,
+		Stats = { Speed = 34, Acceleration = 40, Handling = 48 },
+		Color = { 0.5, 0.5, 0.55 },
+		Description = "Cheap, cheerful, and slow. A backup beater for when you want to grind pocket change.",
+	},
+	{
+		Id = "silv_s15",
+		Name = "Night Slider",
+		Model = "Nissan Silvia S15",
+		Tier = 3,
+		Price = 12000,
+		RepRequired = 50,
+		Stats = { Speed = 74, Acceleration = 70, Handling = 78 },
+		Color = { 0.1, 0.35, 0.85 },
+		Description = "A drift-bred coupe with serious mid-corner poise. The natural step up from the RX-7.",
+	},
+	{
+		Id = "gtr_r34",
+		Name = "Godzilla",
+		Model = "Nissan Skyline GT-R R34",
+		Tier = 4,
+		Price = 45000,
+		RepRequired = 180,
+		Stats = { Speed = 88, Acceleration = 86, Handling = 82 },
+		Color = { 0.15, 0.6, 0.95 },
+		Description = "AWD, twin-turbo, legendary. When you show up in this, people notice.",
+	},
+	{
+		Id = "hyper_x",
+		Name = "Apex Phantom",
+		Model = "Exotic hypercar (stylized)",
+		Tier = 5,
+		Price = 250000,
+		RepRequired = 600,
+		Stats = { Speed = 100, Acceleration = 98, Handling = 90 },
+		Color = { 0.05, 0.05, 0.06 },
+		Description = "Endgame flex. Millions of yen of carbon fibre and neon. The top of the food chain.",
+	},
+}
+
+-- Fast lookup by Id (built once) --------------------------------------------
+Cars.ById = {} :: { [string]: Car }
+for _, car in ipairs(Cars.List) do
+	Cars.ById[car.Id] = car
+end
+
+function Cars.Get(id: string): Car?
+	return Cars.ById[id]
+end
+
+return Cars