first commit

include/DiscordBot.hpp

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+#pragma once
+#include <string>
+#include "Config.hpp"
+#include "State.hpp"
+#include "SniperEngine.hpp"
+
+// This is the whole point of the C++ rewrite request: instead of a Flask web
+// dashboard you had to open in a browser, the sniper is now controlled
+// entirely from Discord with slash commands:
+//
+//   /start                       start watching all configured links
+//   /stop                        stop watching
+//   /status                      running state + per-link stock + totals
+//   /links                       list configured links (with pause state)
+//   /addlink url [label] [min_price] [max_price] [keywords]
+//   /removelink url
+//   /pause url                   toggle pause for one link
+//   /scan url                    force an immediate one-off scan
+//   /interval seconds            change the polling interval
+//   /history                     last 15 scan results
+//
+// Uses D++ (https://dpp.dev/) for the gateway connection + slash commands.
+class DiscordBot {
+public:
+    DiscordBot(AppConfig& config, SniperState& state, SniperEngine& engine, std::string config_path);
+
+    // Blocks forever running the gateway event loop.
+    void run();
+
+private:
+    AppConfig& config_;
+    SniperState& state_;
+    SniperEngine& engine_;
+    std::string config_path_;
+
+    void persist();
+};