chore: remove unused #include directives and clean up .clangd formatting

Remove unused header includes from http_proxy.c, http_proxy_rewrite.c,
m3u.c, rtp_fec.h, and stream.c. Also remove unnecessary YAML document
separators from .clangd config.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: stackia

.clangd

@@ -1,5 +1,3 @@
 # yaml-language-server: $schema=https://json.schemastore.org/clangd.json
----
 CompileFlags:
   Add: [-xc]
----

src/http_proxy.c

@@ -4,13 +4,11 @@
 #include "connection.h"
 #include "http.h" /* For http_url_encode */
 #include "http_proxy_rewrite.h"
-#include "multicast.h"
 #include "platform_compat.h"
 #include "poller.h"
 #include "status.h"
 #include "utils.h"
 #include "worker.h"
-#include "zerocopy.h"
 #include <arpa/inet.h>
 #include <errno.h>
 #include <netdb.h>

src/http_proxy_rewrite.c

@@ -8,7 +8,6 @@
 
 #include "http_proxy_rewrite.h"
 #include "configuration.h"
-#include "http.h" /* For http_url_encode */
 #include "http_proxy.h"
 #include "utils.h"
 #include <ctype.h>

src/m3u.c

@@ -3,7 +3,6 @@
 #include "epg.h"
 #include "http.h"
 #include "http_fetch.h"
-#include "http_proxy.h"
 #include "md5.h"
 #include "service.h"
 #include "url_template.h"

src/rtp_fec.h

@@ -10,7 +10,6 @@
 
 #include <stdint.h>
 
-#include "buffer_pool.h"
 #include "rs_fec.h"
 
 /* Maximum number of FEC groups to track per stream */

src/stream.c

@@ -9,7 +9,6 @@
 #include "snapshot.h"
 #include "status.h"
 #include "utils.h"
-#include "worker.h"
 #include <arpa/inet.h>
 #include <errno.h>
 #include <netdb.h>