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/include/typemap.h

@@ -337,9 +337,14 @@ struct repl_config_reply_s {
 };
 
 struct repl_config_push_req_s {
-    uint64_t     version_tag; /* version tag of the pushed config */
-    xce_data_t  *sha256;      /* 32-byte SHA-256 */
-    xce_data_t  *bytes;       /* serialised ClusterConfig blob */
+    uint64_t     version_tag;   /* version tag of the pushed config */
+    xce_data_t  *sha256;        /* 32-byte SHA-256 (decoded, not usable as raw bytes) */
+    xce_data_t  *bytes;         /* serialised ClusterConfig blob (decoded, not usable) */
+    /* Pre-extracted raw fields populated by xce_decode() before capn_free(),
+     * mirroring the same pattern as upgrade_config_req_t.  Owned by the struct. */
+    uint8_t     *raw_sha256;    /* 32-byte SHA-256, malloc'd, or NULL */
+    uint8_t     *raw_bytes;     /* serialised ClusterConfig blob, malloc'd, or NULL */
+    size_t       raw_bytes_len; /* length of raw_bytes */
 };
 
 struct repl_config_push_reply_s {

src/include/xce/cluster_def.h

@@ -96,7 +96,8 @@ typedef struct {
 
 typedef struct cluster_s {
     myconf_t*           myconf;
-    xce_peerinfo_t*     myhost;
+    xce_peerinfo_t*     myhost;       /* points at myhost_info once initialised */
+    xce_peerinfo_t      myhost_info;  /* storage; name set from myconf->name */
     hooksys_t           hooksys;
     iomgr_t             iomgr;
     zarray_t            endpoints;