refactor: move sqlite3 db from topo_group to UTUN_INSTANCE, remove conn_mgr/topo_group deps from chatgui

- topo_sqlite_db moved from TOPO_GROUPS to UTUN_INSTANCE (direct access)
- topo_groups_set_sqlite_db() removed
- chatgui: chat_sync_connect_node → chat_core_connect_auto (direct ETCP, no conn_mgr)
- chatgui: chat_core_connect_from_invite saves to SQLite → auto connect (no BGP)
- chatgui: removed _on_node_updated BGP callback from member_sync
- chatgui: removed conn_mgr_get_status from status dump
- chatgui: removed all conn_mgr.h and topo_group.h includes
- chatgui: CONN_MGR_ERR_* constants → CC_* in chat_core.h
- removed unused cc_parallel_* code, conn_state_str/conn_type_str helpers

src/db_sync.c

@@ -369,8 +369,8 @@ static int db_chain_hash8_at(struct DB_SYNC_INSTANCE* si, uint32_t pos, uint64_t
 static int db_get_ed25519_pubkey(struct DB_SYNC* db, uint64_t node_id, uint8_t out[32])
 {
     if (node_id == db->inst->node_id) { memcpy(out, db->inst->my_ed25519_pubkey, 32); return 0; }
-    if (db->inst->topo_groups && db->inst->topo_groups->topo_sqlite_db) {
-        if (topo_node_sqlite_get_ed25519_pubkey(db->inst->topo_groups->topo_sqlite_db, node_id, out) == 0) return 0;
+    if (db->inst->topo_sqlite_db) {
+        if (topo_node_sqlite_get_ed25519_pubkey(db->inst->topo_sqlite_db, node_id, out) == 0) return 0;
     }
     struct ll_entry* e = queue_find_data_by_index(db->inst->connections, (const uint8_t*)&node_id);
     if (e) {

src/topo_group.c

@@ -254,16 +254,16 @@ struct TOPO_GROUPS* topo_groups_init(struct UTUN_INSTANCE* instance) {
     g->v6_subnet_pool    = memory_pool_init(sizeof(struct TOPO_SUBNET6), "to_v6sub");
 
     if (instance->config && instance->config->global.db_path[0]) {
-        int rc = sqlite3_open(instance->config->global.db_path, &g->topo_sqlite_db);
-        if (rc == SQLITE_OK && g->topo_sqlite_db) {
-            sqlite3_exec(g->topo_sqlite_db, "PRAGMA journal_mode=WAL", NULL, NULL, NULL);
-            sqlite3_exec(g->topo_sqlite_db, "PRAGMA foreign_keys=ON", NULL, NULL, NULL);
-            topo_node_sqlite_init(g->topo_sqlite_db);
+        int rc = sqlite3_open(instance->config->global.db_path, &instance->topo_sqlite_db);
+        if (rc == SQLITE_OK && instance->topo_sqlite_db) {
+            sqlite3_exec(instance->topo_sqlite_db, "PRAGMA journal_mode=WAL", NULL, NULL, NULL);
+            sqlite3_exec(instance->topo_sqlite_db, "PRAGMA foreign_keys=ON", NULL, NULL, NULL);
+            topo_node_sqlite_init(instance->topo_sqlite_db);
             DEBUG_INFO(DEBUG_CATEGORY_BGP, "SQLite opened: %s", instance->config->global.db_path);
         } else {
             DEBUG_ERROR(DEBUG_CATEGORY_BGP, "sqlite3_open(%s) failed: %s",
-                        instance->config->global.db_path, g->topo_sqlite_db ? sqlite3_errmsg(g->topo_sqlite_db) : "null db");
-            if (g->topo_sqlite_db) { sqlite3_close(g->topo_sqlite_db); g->topo_sqlite_db = NULL; }
+                        instance->config->global.db_path, instance->topo_sqlite_db ? sqlite3_errmsg(instance->topo_sqlite_db) : "null db");
+            if (instance->topo_sqlite_db) { sqlite3_close(instance->topo_sqlite_db); instance->topo_sqlite_db = NULL; }
         }
     }
 
@@ -314,7 +314,7 @@ void topo_groups_destroy(struct UTUN_INSTANCE* instance) {
     memory_pool_destroy(g->v4_subnet_pool);
     memory_pool_destroy(g->v6_subnet_pool);
 
-    if (g->topo_sqlite_db) { sqlite3_close(g->topo_sqlite_db); g->topo_sqlite_db = NULL; }
+    if (instance->topo_sqlite_db) { sqlite3_close(instance->topo_sqlite_db); instance->topo_sqlite_db = NULL; }
 
     u_free(g); instance->topo_groups = NULL;
 }
@@ -340,12 +340,6 @@ struct TOPO_GROUP* topo_groups_create_group(struct TOPO_GROUPS* g, uint64_t grou
     return group;
 }
 
-void topo_groups_set_sqlite_db(struct TOPO_GROUPS* g, sqlite3* db) {
-    if (!g) return;
-    g->topo_sqlite_db = db;
-    DEBUG_INFO(DEBUG_CATEGORY_BGP, "topo_sqlite_db set");
-}
-
 void topo_group_set_nat_check_local(struct TOPO_GROUP* group, int allow) {
     if (!group || !group->instance || !group->instance->nat_det) return;
     nat_detection_set_allow_local(group->instance->nat_det, allow);
@@ -587,7 +581,7 @@ int topo_group_process_nodeinfo(struct TOPO_GROUP* group, struct ETCP_CONN* from
 
     if (group->group_type != TOPO_GROUP_TYPE_CHAT && group->instance->rt) route_insert(group->instance->rt, nodeinfo1);
     if (node_id != group->instance->node_id) {
-        sqlite3* sdb = group->instance->topo_groups->topo_sqlite_db;
+        sqlite3* sdb = group->instance->topo_sqlite_db;
         if (sdb) {
             topo_node_sqlite_node_put(sdb, nodeinfo1);
             if (group->group_type == TOPO_GROUP_TYPE_CHAT && group->channel_id[0]) {
@@ -646,8 +640,8 @@ int topo_group_process_withdraw(struct TOPO_GROUP* group, struct ETCP_CONN* send
         struct ll_entry* entry = queue_find_data_by_index(group->nodes, &node_id);
         if (entry) { queue_remove_data(group->nodes, entry); queue_entry_free(entry); }
         topo_group_broadcast_withdraw(group, node_id, wd_source, sender);
-        if (group->group_type == TOPO_GROUP_TYPE_CHAT && group->instance->topo_groups->topo_sqlite_db)
-            topo_node_sqlite_member_del(group->instance->topo_groups->topo_sqlite_db, group->channel_id, node_id);
+        if (group->group_type == TOPO_GROUP_TYPE_CHAT && group->instance->topo_sqlite_db)
+            topo_node_sqlite_member_del(group->instance->topo_sqlite_db, group->channel_id, node_id);
     }
     return 0;
 }

src/topo_group.h

@@ -132,7 +132,6 @@ struct TOPO_GROUPS {
     struct memory_pool* v6_addr_pool;
     struct memory_pool* v4_subnet_pool;
     struct memory_pool* v6_subnet_pool;
-    sqlite3* topo_sqlite_db;
     topo_node_updated_fn node_updated_cb; /* optional — set by chatgui's member_sync */
 };
 
@@ -242,8 +241,6 @@ int topo_group_remove_path(struct TOPO_NODEQ* nq, struct ETCP_CONN* conn);
 
 void topo_groups_set_node_updated_cb(struct TOPO_GROUPS* groups, topo_node_updated_fn fn);
 
-void topo_groups_set_sqlite_db(struct TOPO_GROUPS* g, sqlite3* db);
-
 /** Разрешить/запретить NAT check для локальных подсетей (тестовый хелпер, делегат в nat_detection) */
 void topo_group_set_nat_check_local(struct TOPO_GROUP* group, int allow);
 

src/utun_instance.h

@@ -10,6 +10,7 @@ extern "C" {
 #include <stdbool.h>
 #include <stdio.h>
 #include "../lib/memory_pool.h"
+#include "../lib/sqlite3.h"
 #include "secure_channel.h"
 #include "etcp_api.h"
 #include "config_parser.h"
@@ -75,6 +76,7 @@ struct UTUN_INSTANCE {
 
     struct ROUTE_TABLE* rt;
     struct TOPO_GROUPS* topo_groups;    // Groups module for topology exchange
+    sqlite3* topo_sqlite_db;            // Shared SQLite DB (nodes/channels/peers)
     struct NAT_DETECTION* nat_det;      // NAT detection module
     
     // Identification