delete dead code

src/models/ticker_info.zig

@@ -1,19 +0,0 @@
-pub const SecurityType = enum {
-    stock,
-    etf,
-    mutual_fund,
-    index,
-    crypto,
-    forex,
-    unknown,
-};
-
-/// Basic information about a ticker symbol.
-pub const TickerInfo = struct {
-    symbol: []const u8,
-    name: ?[]const u8 = null,
-    exchange: ?[]const u8 = null,
-    security_type: SecurityType = .unknown,
-    currency: ?[]const u8 = null,
-    country: ?[]const u8 = null,
-};