initial: modular iptv-dl with runtime config from ~/.iptv-downloader/config.json

config.h

@@ -0,0 +1,63 @@
+#pragma once
+#include <stddef.h>
+
+/* ── Compile-time limits (not user-configurable) ───────────────── */
+#define MAX_DL        256
+#define MAX_NOTIF     50
+#define BACKLOG       32
+#define CURL_DL_TIMEOUT  7200L
+#define CURL_API_TIMEOUT 20L
+
+/* ── Runtime configuration struct ─────────────────────────────── */
+typedef struct {
+    /* Network */
+    int  port;
+    char bind_iface[64];     /* "" = no binding, "wg0-mullvad" = VPN only */
+
+    /* IPTV provider (Xtream Codes) */
+    char iptv_api[512];
+    char iptv_user[128];
+    char iptv_pass[128];
+    char stream_base[512];
+
+    /* Download directories */
+    char dl_dir_tv[512];
+    char dl_dir_mov[512];
+
+    /* Integrations */
+    char discord_webhook[512];
+    char jellyfin_url[512];
+    char jellyfin_token[256];
+
+    /* Paths */
+    char template_dir[512];  /* dir containing header.html, footer.html, iptv.css, *.js */
+    char data_dir[512];      /* dir for history.json, notifications.json */
+
+    /* Limits */
+    long max_recv_speed;     /* bytes/sec, 0 = unlimited */
+} Config;
+
+extern Config g_cfg;
+
+/*
+ * Config load order (first found wins):
+ *   1. Path passed to config_load(path) if non-NULL
+ *   2. $IPTV_DL_CONFIG env var
+ *   3. ~/.iptv-downloader/config.json
+ *   4. /etc/iptv-downloader/config.json
+ *   5. Built-in defaults (works with no config file)
+ *
+ * Returns path used (static buffer), or NULL if using defaults only.
+ */
+const char *config_load(const char *explicit_path);
+
+/* Write current g_cfg back to the path that was loaded */
+void config_save(void);
+
+/* Print current config as JSON to stderr */
+void config_dump(void);
+
+/* Return history file path: data_dir/history.json */
+void config_history_path(char *buf, size_t n);
+/* Return notifications file path: data_dir/notifications.json */
+void config_notif_path(char *buf, size_t n);