refactor/feature/fix: Major refactor of codebase

refactor(stdio): replace console/terminal command system with buffer-based stdio
- Introduced stdio.pas as the unified command I/O layer.
- All 31 command procedures across 15 files now receive stdin_buf,
  stdout_buf, and stderr_buf (POutBuf) instead of a single outbuf.
- vterminal.pas creates all three buffers per command invocation and
  displays both stdout and stderr.
- Deleted console.pas, terminal.pas, and 9 obsolete windowing programs
  (shell, splash, edit, memview, themer, netlog, vmlog, vmstate, udpcat).
- Migrated all registerCommand calls to stdio, rewrote vterminal
  processCommand to use stdio.findCommand, and added proper error
  routing to stderr for invalid params, bad paths, and system errors.

refactor(syslog): replace console logging with serial-backed syslog
- Introduced syslog.pas for kernel-level logging over serial/dev.
- Migrated all boot logging in kernel.pas from console.outputln/
  writestringln to syslog.logln/writestringln.
- Converted 19 fault handlers, hashmap, lists, scheduler, tracer, net,
  udp, and all driver init paths to use syslog.
- Rewrote BSOD in util.pas (50+ calls) from console to syslog.
- Removed CONSOLE_SLOW_REDRAW, TRGB565, TRGB565Pair, and HWND
  from system.pas.

fix(keyboard): add ring buffer and proper press/release cycling for LVGL input
- Replaced the single last_key/key_pressed slot in lvgl.pas with a
  16-entry ring buffer (kb_buf, kb_head, kb_tail) to prevent ISR
  overwrites when typing fast.
- Added a kb_pending_release flag so each keystroke gets a
  full PRESSED->RELEASED cycle before the next key is consumed —
  LVGL requires this pairing and was silently dropping intermediate
  keys when receiving consecutive PRESSED events without
  intervening releases.

feat(vterminal): use Hack monospace font for terminal output
- Added Hack Regular 14px (hack_14.c) as a custom LVGL font.
- Removed the .static_bitmap field from the generated font file
  (not present in LVGL 9.2 lv_font_t struct).
- Declared the hack_14 external symbol in lvgl.pas and switched
  vterminal's text label from lv_font_montserrat_14 to hack_14
  for proper monospace terminal rendering.

src/driver/net/l4/icmp.pas

@@ -24,7 +24,7 @@ interface
 uses
     bios_data_area,
     lmemorymanager,
-    net, nettypes, netutils, ipv4, console, terminal, arp, util;
+    net, nettypes, netutils, ipv4, arp, util;
 
 type
     TARPErrorCode     = (aecFailedToResolveHost, aecNoRouteToHost, aecTimeout, aecTTLExpired);
@@ -44,6 +44,9 @@ procedure ping_rep(hdr : PICMPHeader);
 
 implementation
 
+uses
+    stdio, strings;
+
 var
     Handlers : Array[0..255] of TARPHandler;
 
@@ -163,27 +166,29 @@ begin
 end;
 
 var
-    PING_T1 : uint64;
-    PING_N  : uint16;
-    PING_C  : uint16;
-    PING_L  : uint32;
-    PING_IP : puint8;
+    PING_T1  : uint64;
+    PING_N   : uint16;
+    PING_C   : uint16;
+    PING_L   : uint32;
+    PING_IP  : puint8;
+    PING_STDOUT : POutBuf;
+    PING_STDERR : POutBuf;
 
 procedure ping_err(hdr : PICMPHeader; Reason : TARPErrorCode);
 begin
-    writestringWND('Ping Error: ', getTerminalHWND);
+    stdio.bufWriteStr(PING_STDERR, 'Ping Error: ');
     case Reason of
-        aecFailedToResolveHost:writestringlnWND('Failed to resolve host.', getTerminalHWND);
-        aecNoRouteToHost:writestringlnWND('No route to host.', getTerminalHWND);
-        aecTimeout:writestringlnWND('Timeout expired.', getTerminalHWND);
-        aecTTLExpired:writestringlnWND('TTL Expired.', getTerminalHWND);
+        aecFailedToResolveHost:stdio.bufWriteStrLn(PING_STDERR, 'Failed to resolve host.');
+        aecNoRouteToHost:stdio.bufWriteStrLn(PING_STDERR, 'No route to host.');
+        aecTimeout:stdio.bufWriteStrLn(PING_STDERR, 'Timeout expired.');
+        aecTTLExpired:stdio.bufWriteStrLn(PING_STDERR, 'TTL Expired.');
     end;
     PING_T1:= Counters.c64;
     INC(PING_C);
     if PING_C < PING_N then begin
         sendICMPRequest(PING_IP, PING_C, 128, @ping_rep, @ping_err);
     end else begin
-        terminal.done(PING_L);
+        stdio.done(PING_L);
     end;
 end;
 
@@ -193,15 +198,15 @@ var
 
 begin
     PING_T2:= Counters.c64;
-    writestringWND('Ping Reply: ', getTerminalHWND);
-    writeIntWND(PING_T2-PING_T1, getTerminalHWND);
-    writeStringlnWND('ms.', getTerminalHWND);
+    stdio.bufWriteStr(PING_STDOUT, 'Ping Reply: ');
+    stdio.bufWriteInt(PING_STDOUT, PING_T2-PING_T1);
+    stdio.bufWriteStrLn(PING_STDOUT, 'ms.');
     PING_T1:= PING_T2;
     INC(PING_C);
     if PING_C < PING_N then begin
         sendICMPRequest(PING_IP, PING_C, 128, @ping_rep, @ping_err);
     end else begin
-        terminal.done(PING_L);
+        stdio.done(PING_L);
     end;
 end;
 
@@ -210,7 +215,7 @@ begin
     PING_N:= 0;
 end;
 
-procedure terminal_command_ping(Params : PParamList);
+procedure terminal_command_ping(Params : PParamList; stdin_buf, stdout_buf, stderr_buf : POutBuf);
 var
     ip_str : pchar;
     ip : puint8;
@@ -220,7 +225,9 @@ begin
         ip_str:= getParam(0, Params);
         ip:= stringToIPv4(ip_str);
         if ip <> nil then begin
-            terminal.halt(PING_L, @ping_terminate);
+            PING_STDOUT:= stdout_buf;
+            PING_STDERR:= stderr_buf;
+            stdio.halt(PING_L, @ping_terminate);
             PING_L:= Counters.c32;
             PING_N:= 10;
             PING_C:= 0;
@@ -242,7 +249,7 @@ begin
         Handlers[i].OnReply:= nil;
     end;
     ipv4.registerProtocol($01, @recv);
-    terminal.registerCommand('PING', @terminal_command_ping, 'Ping a host.');
+    stdio.registerCommand('PING', @terminal_command_ping, 'Ping a host.');
 end;
 
 end.