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/pilog.cpp

@@ -1,6 +1,6 @@
 /*
     PIP - Platform Independent Primitives
-	High-level log
+    High-level log
     Ivan Pelipenko peri4ko@yandex.ru
 
     This program is free software: you can redistribute it and/or modify
@@ -24,6 +24,8 @@
 #include "piliterals_time.h"
 #include "pitime.h"
 
+#ifndef PIP_NO_THREADS
+#  ifndef PIP_NO_FILESYSTEM
 
 //! \class PILog pilog.h
 //! \details
@@ -124,12 +126,12 @@ PIStringList PILog::readAllLogs() const {
 	auto it               = names.makeIterator();
 	bool was_own          = false;
 	auto readFile         = [&ret](PIFile * f) {
-		PIIOTextStream ts(f);
-		PIString line;
-		while (!ts.isEnd()) {
-			line = ts.readLine().trim();
-			if (line.isNotEmpty()) ret << line;
-		}
+        PIIOTextStream ts(f);
+        PIString line;
+        while (!ts.isEnd()) {
+            line = ts.readLine().trim();
+            if (line.isNotEmpty()) ret << line;
+        }
 	};
 	while (it.next()) {
 		PIFile * f = nullptr;
@@ -203,8 +205,8 @@ void PILog::newFile() {
 	PIString aname = log_name;
 	if (aname.isNotEmpty()) aname += "__";
 	log_file.open(log_dir + "/" + aname + PIDateTime::current().toString("yyyy_MM_dd__hh_mm_ss") + ".log." +
-					  PIString::fromNumber(++part_number),
-				  PIIODevice::ReadWrite);
+	                  PIString::fromNumber(++part_number),
+	              PIIODevice::ReadWrite);
 }
 
 
@@ -245,3 +247,6 @@ void PILog::run() {
 		}
 	}
 }
+
+#  endif // PIP_NO_FILESYSTEM
+#endif   // PIP_NO_THREADS