feat(c-miner): port miner pipeline to modular C implementation

config.h

@@ -0,0 +1,32 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef struct {
+    char rpc_user[128];
+    char rpc_password[128];
+    char rpc_host[128];
+    int rpc_port;
+
+    char wallet_address[128];
+
+    double difficulty_factor;
+    char nonce_mode[16];
+    int timestamp_update_interval;
+    uint32_t batch;
+    char coinbase_message[128];
+    char extranonce1[128];
+    char extranonce2[128];
+
+    int num_processors;
+    int check_interval;
+} MinerConfig;
+
+void config_set_defaults(MinerConfig *cfg);
+bool config_load(const char *path, MinerConfig *cfg);
+bool config_validate(const MinerConfig *cfg);
+void config_print(const MinerConfig *cfg);
+
+#endif