etcp_router: Ed25519 digital signature for service messages

- Add ed25519_public_key[32] to NODEINFO struct for pubkey distribution
- Add ed25519_public_key[32] to ROUTE_BGP (derived from X25519 privkey at init)
- Add ROUTER_FLAG_SIGNED (0x08) to SVC_ROUTE_HDR flags byte
- router_send_one_flags: when is_signed, sign [hdr][payload] and append 64-byte sig
- etcp_router_recv_cb: verify Ed25519 signature when ROUTER_FLAG_SIGNED set
- New API: etcp_router_conn_send_signed()
- Drop signed packets if sender node not in routing table or no Ed25519 key
- 5 unit tests in test_etcp_router_unit.c covering OK/tampered/unknown/no-key/short

lib/Makefile.am

@@ -28,14 +28,19 @@ libuasync_a_SOURCES = \
 	serialize.c \
 	serialize.h \
 	tcp_io.c \
-	tcp_io.h
+	tcp_io.h \
+	liblmdb/mdb.c \
+	liblmdb/midl.c \
+	liblmdb/lmdb.h \
+	liblmdb/midl.h
 
 libuasync_a_CFLAGS = \
 	-D_ISOC99_SOURCE \
 	-DDEBUG_OUTPUT_STDERR \
 	-g \
 	-I$(top_srcdir)/src \
-	-I$(top_srcdir)/lib
+	-I$(top_srcdir)/lib \
+	-I$(srcdir)/liblmdb
 
 # Clean build directory
 clean-local: