[#879] Add airdrop campaign config module

lib/airdrop/config.ts

@@ -0,0 +1,87 @@
+/**
+ * Airdrop campaign configuration (#879)
+ *
+ * Switch between test/prod via NEXT_PUBLIC_AIRDROP_MODE env var.
+ * Test mode uses small pool + low milestones for 3-day test runs.
+ */
+
+export interface Milestone {
+  readonly mcap: number;
+  readonly pct: number;
+}
+
+export interface AirdropConfig {
+  readonly CAMPAIGN_START: Date;
+  readonly CAMPAIGN_END: Date;
+  readonly POOL_AMOUNT: number;
+  readonly MILESTONES: {
+    readonly BRONZE: Milestone;
+    readonly SILVER: Milestone;
+    readonly GOLD: Milestone;
+  };
+  readonly LOCKER_ID: string | null;
+  readonly POINTS: {
+    readonly BUY_PER_PLOT: number;
+    readonly REFERRAL_PCT: number;
+    readonly WRITE_FLAT: number;
+    readonly RATE_FLAT: number;
+    readonly RATE_DAILY_CAP: number;
+  };
+  readonly STREAK_BOOSTS: Record<number, number>;
+  readonly STREAK_MIN_GAP_MINUTES: number;
+}
+
+export type MilestoneTier = keyof AirdropConfig["MILESTONES"];
+
+const POINTS = {
+  BUY_PER_PLOT: 1,
+  REFERRAL_PCT: 20,
+  WRITE_FLAT: 50,
+  RATE_FLAT: 5,
+  RATE_DAILY_CAP: 10,
+} as const;
+
+const STREAK_BOOSTS: Record<number, number> = {
+  7: 0.05,
+  14: 0.10,
+  30: 0.20,
+  50: 0.30,
+  100: 0.50,
+};
+
+const STREAK_MIN_GAP_MINUTES = 30;
+
+const TEST_CONFIG: AirdropConfig = {
+  CAMPAIGN_START: new Date("2026-06-01"),
+  CAMPAIGN_END: new Date("2026-06-04"),       // start + 3 days
+  POOL_AMOUNT: 10,                            // 10 PLOT
+  MILESTONES: {
+    BRONZE: { mcap: 7_000, pct: 10 },
+    SILVER: { mcap: 10_000, pct: 30 },
+    GOLD: { mcap: 50_000, pct: 100 },
+  },
+  LOCKER_ID: null,
+  POINTS,
+  STREAK_BOOSTS,
+  STREAK_MIN_GAP_MINUTES,
+};
+
+const PROD_CONFIG: AirdropConfig = {
+  CAMPAIGN_START: new Date("2026-07-01"),
+  CAMPAIGN_END: new Date("2027-01-01"),       // start + 6 months
+  POOL_AMOUNT: 50_000,
+  MILESTONES: {
+    BRONZE: { mcap: 1_000_000, pct: 10 },
+    SILVER: { mcap: 10_000_000, pct: 30 },
+    GOLD: { mcap: 70_000_000, pct: 100 },
+  },
+  LOCKER_ID: null,
+  POINTS,
+  STREAK_BOOSTS,
+  STREAK_MIN_GAP_MINUTES,
+};
+
+const mode = process.env.NEXT_PUBLIC_AIRDROP_MODE ?? "prod";
+
+export const AIRDROP_CONFIG: AirdropConfig =
+  mode === "test" ? TEST_CONFIG : PROD_CONFIG;