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/application/pisystemmonitor.h

@@ -28,6 +28,7 @@
 #include "pifile.h"
 #include "pithread.h"
 
+#ifndef PIP_NO_THREADS
 
 //! \~\ingroup Application
 //! \~\brief
@@ -51,7 +52,7 @@ public:
 	//! \~russian Останавливает мониторинг и отсоединяет объект от текущей цели.
 	~PISystemMonitor();
 
-#pragma pack(push, 1)
+#  pragma pack(push, 1)
 	//! \~\ingroup Application
 	//! \~\brief
 	//! \~english Process statistics (fixed-size fields).
@@ -155,7 +156,7 @@ public:
 		//! \~russian Дата и время создания
 		PIDateTime created;
 	};
-#pragma pack(pop)
+#  pragma pack(pop)
 
 	//! \~\ingroup Application
 	//! \~\brief
@@ -205,12 +206,12 @@ public:
 		PIString name;
 	};
 
-#ifndef MICRO_PIP
+#  ifndef PIP_NO_PROCESS
 
 	//! \~english Starts monitoring the process with PID "pID" using the given update interval.
 	//! \~russian Запускает мониторинг процесса с PID "pID" с указанным интервалом обновления.
 	bool startOnProcess(int pID, PISystemTime interval = PISystemTime::fromSeconds(1.));
-#endif
+#  endif // PIP_NO_PROCESS
 
 	//! \~english Starts monitoring the current application process.
 	//! \~russian Запускает мониторинг текущего процесса приложения.
@@ -271,9 +272,9 @@ private:
 	PIMap<llong, PIString> tbid;
 	mutable PIMutex stat_mutex;
 	int pID_, page_size, cpu_count, cycle;
-#ifndef MICRO_PIP
+#  ifndef PIP_NO_PROCESS
 	PRIVATE_DECLARATION(PIP_EXPORT)
-#endif
+#  endif // PIP_NO_PROCESS
 
 	class PIP_EXPORT Pool {
 		friend class PISystemMonitor;
@@ -337,4 +338,5 @@ BINARY_STREAM_READ(PISystemMonitor::ThreadStats) {
 	return s;
 }
 
+#endif // PIP_NO_THREADS
 #endif // PISYSTEMMONITOR_H