refactor: migrate MICRO_PIP to fine-grained feature flags

Replace monolithic MICRO_PIP/PIP_MICRO with granular flags:

Feature flags (CMake options + platform auto-detection):
- PIP_NO_FILESYSTEM, PIP_NO_THREADS, PIP_NO_SOCKET
- PIP_NO_PROCESS, PIP_NO_DYNLIB, PIP_NO_FFT, PIP_NO_SERIAL

Embedded optimization flag:
- PIP_EMBEDDED (auto-set for Pico SDK and FreeRTOS)
  Controls buffer sizes, time stubs, terminal fallback, init stubs

Platform blocks in CMakeLists.txt:
- Pico SDK: auto-disables FS, PROCESS, DYNLIB, FFT, SERIAL;
  conditionally disables THREADS (no FreeRTOS) and SOCKET (no LWIP)
- FreeRTOS: auto-disables FS, PROCESS, DYNLIB, FFT, SERIAL;
  conditionally disables SOCKET (no LWIP)
- Android: auto-disables PROCESS, DYNLIB, FFT

Updated 96 files across libs/, utils/, tests/, and CMakeLists.txt.
Builds verified for Linux (547 tests pass) and Pico SDK (100%).
Removed all MICRO_PIP and PIP_MICRO references (0 remaining).

libs/main/io_devices/pibinarylog.cpp

@@ -23,10 +23,12 @@
 #include "piliterals_bytes.h"
 #include "piliterals_time.h"
 #include "pipropertystorage.h"
-#include "pitime.h"
-#include "pitranslator.h"
 
-#define PIBINARYLOG_VERSION_OLD 0x31
+#ifndef PIP_NO_FILESYSTEM
+#  include "pitime.h"
+#  include "pitranslator.h"
+
+#  define PIBINARYLOG_VERSION_OLD 0x31
 
 /*! \class PIBinaryLog
  * \brief Class for read and write binary data to logfile, and playback this data in realtime, or custom speed
@@ -52,17 +54,17 @@
 
 static const uchar binlog_sig[] = {'B', 'I', 'N', 'L', 'O', 'G'};
 
-#define PIBINARYLOG_VERSION        0x32
-#define PIBINARYLOG_SIGNATURE_SIZE sizeof(binlog_sig)
+#  define PIBINARYLOG_VERSION        0x32
+#  define PIBINARYLOG_SIGNATURE_SIZE sizeof(binlog_sig)
 
 REGISTER_DEVICE(PIBinaryLog)
 
 PIBinaryLog::PIBinaryLog() {
-#ifdef MICRO_PIP
+#  ifdef PIP_NO_THREADS
 	setThreadedReadBufferSize(512);
-#else
+#  else
 	setThreadedReadBufferSize(64_KiB);
-#endif
+#  endif // PIP_NO_THREADS
 	is_started = is_indexed = is_pause = false;
 	create_index_on_fly                = false;
 	current_index                      = -1;
@@ -1008,3 +1010,5 @@ void PIBinaryLog::CompleteIndex::makeIndexPos() {
 	for (uint i = 0; i < index.size(); i++)
 		index_pos[index[i].pos] = i;
 }
+
+#endif // PIP_NO_FILESYSTEM