v0.7.25 - Implement SQL Query Admin API

- Move non-NIP-17 admin functions from dm_admin.c to api.c for better architecture
- Add NIP-44 encryption to send_admin_response() for secure admin responses
- Implement SQL query validation and execution with safety limits
- Add unified SQL query handler for admin API
- Fix buffer size for encrypted content to handle larger responses
- Update function declarations and includes across files
- Successfully test frontend query execution through web interface

src/dm_admin.h

@@ -24,4 +24,11 @@ int send_nip17_response(const char* sender_pubkey, const char* response_content,
 char* generate_config_text(void);
 char* generate_stats_text(void);
 
+// SQL query admin functions
+int validate_sql_query(const char* query, char* error_message, size_t error_size);
+char* execute_sql_query(const char* query, const char* request_id, char* error_message, size_t error_size);
+int handle_sql_query_unified(cJSON* event, const char* query, char* error_message, size_t error_size, struct lws* wsi);
+int send_admin_response(const char* sender_pubkey, const char* response_content, const char* request_id,
+                       char* error_message, size_t error_size, struct lws* wsi);
+
 #endif // DM_ADMIN_H