Rename source and makefile

termtcp_cli.c -> termtcp.c
Makefile_CLI  -> Makefile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Makefile

@@ -1,12 +1,11 @@
-# TermTCP CLI - Makefile
-# Simple command-line TCP client
+# TermTCP - Makefile
 
 CC = gcc
 CFLAGS = -Wall -Wextra -O2 -std=gnu99 -D_XOPEN_SOURCE_EXTENDED
 LDFLAGS = -lm -lncursesw
 
 TARGET = termtcp
-SOURCE = termtcp_cli.c
+SOURCE = termtcp.c
 OBJECT = $(SOURCE:.c=.o)
 
 # Default target
@@ -52,7 +51,7 @@ lint:
 
 # Help
 help:
-	@echo "TermTCP CLI Build Targets:"
+	@echo "TermTCP Build Targets:"
 	@echo "  make              - Build the application"
 	@echo "  make debug        - Build with debug symbols"
 	@echo "  make run          - Build and run"