fix(ha): fix config replication to standbys; add replConfigPush handler

- config_repl.c: add handle_repl_config_push — standby handler for
  OPCode_replConfigPush. Verifies SHA-256, saves blob to disk via
  conf_save_config, reloads via load_primary_config, ACKs primary.
- config_repl.h: declare handle_repl_config_push.
- cluster.c: dispatch OPCode_replConfigPush to handle_repl_config_push;
  populate c->myhost_info.name from myconf->name (ctrl-1/ctrl-2/ctrl-3)
  instead of the static "controller" placeholder.
- ha.c: fix raft_cb_become_leader push_config_to_standbys call to pass
  real config bytes and tag read from disk (was NULL/0 — standbys got
  empty push and never saved config).
- typemap.h: add raw_sha256/raw_bytes/raw_bytes_len fields to
  repl_config_push_req_t (mirrors upgrade_config_req_t pattern).
- request.c: pre-extract List(UInt8) sha256/bytes from OPCode_replConfigPush
  before capn_free() in xce_decode(); free them in xce_free_request().
- helper.c: add all HA/replication opcode names to xce_request_op_name
  so "unknown opcode 30" becomes "replConfigPush" in logs.
- cluster_def.h: add embedded myhost_info field to cluster_t struct.
- ha.h: declare ha_start_primary_heartbeat; remove dead
  ha_find_and_connect_to_primary declaration.

src/controller/cluster.c

@@ -333,6 +333,10 @@ static int myreq_handler(vtask_t* task)
     case OPCode_replConfig:
         rc = handle_config_request(c, ep, &request);
         break;
+    case OPCode_replConfigPush:
+        /* Primary pushes config to this standby — save and reload */
+        rc = handle_repl_config_push(c, ep, &request);
+        break;
     case OPCode_upgradeConfig:
 #if CONF_ENABLE_UPGRADE_CONFIG
         /* OPCode_upgradeConfig is sent BY the primary TO standbys to push config.
@@ -753,7 +757,12 @@ int cluster_init_phase1(cluster_t* c)
     if (c == NULL)
         return -EINVAL;
 
-    c->myhost       = &from_controller;
+    /* Populate myhost_info so replies identify this node by its real name
+     * (e.g. ctrl-1) rather than the generic "controller" placeholder. */
+    c->myhost_info.name = (c->myconf && c->myconf->name)
+                          ? c->myconf->name : from_controller.name;
+    c->myhost_info.key  = from_controller.key;
+    c->myhost           = &c->myhost_info;
     c->ncontrollers = 1;
     c->myidx        = 0;