Black Pharao Release Fix 5 - OpenSSL 3.x and modern Boost compatibility

Port codebase to build with OpenSSL 3.x and Boost 1.90+:
- Rewrite bignum.h to use BIGNUM* pointer instead of inheriting from opaque BIGNUM
- Fix ECDSA_SIG, EVP_CIPHER_CTX, HMAC_CTX opaque type access across key.cpp, crypter.cpp, smessage.cpp
- Modernize Boost.Asio API (io_context, resolver, executor) in trianglesrpc.cpp
- Remove embedded Tor v2 client (incompatible with OpenSSL 3.x), keep Tor v3 SOCKS5 approach
- Update header logo to Cryptographic Triangles branding (300x63)
- Replace Bittrex exchange link with Pinball (313.cash) across all locales
- Fix MSYS2/MinGW64 build: linker flags, Boost library names, miniupnpc static linking

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/init.cpp

@@ -13,7 +13,7 @@
 #include "smessage.h"
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
-#include <boost/filesystem/convenience.hpp>
+// boost/filesystem/convenience.hpp removed in modern Boost; functionality is in filesystem.hpp
 #include <boost/interprocess/sync/file_lock.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <openssl/crypto.h>
@@ -25,6 +25,7 @@
 
 using namespace std;
 using namespace boost;
+namespace fs = boost::filesystem;
 
 CWallet* pwalletMain;
 CClientUIInterface uiInterface;
@@ -97,7 +98,7 @@ void Shutdown(void* parg)
         bitdb.Flush(false);
         StopNode();
         bitdb.Flush(true);
-        boost::filesystem::remove(GetPidFile());
+        fs::remove(GetPidFile());
         UnregisterWallet(pwalletMain);
         delete pwalletMain;
         NewThread(ExitTimeout, NULL);
@@ -147,7 +148,7 @@ bool AppInit(int argc, char* argv[])
         //
         // If Qt is used, parameters/triangles.conf are parsed in qt/triangles.cpp's main()
         ParseParameters(argc, argv);
-        if (!boost::filesystem::is_directory(GetDataDir(false)))
+        if (!fs::is_directory(GetDataDir(false)))
         {
             fprintf(stderr, "Error: Specified directory does not exist\n");
             Shutdown(NULL);
@@ -526,11 +527,11 @@ bool AppInit2()
     std::string strWalletFileName = GetArg("-wallet", "wallet.dat");
 
     // strWalletFileName must be a plain filename without a directory
-    if (strWalletFileName != boost::filesystem::basename(strWalletFileName) + boost::filesystem::extension(strWalletFileName))
+    if (strWalletFileName != fs::path(strWalletFileName).stem().string() + fs::path(strWalletFileName).extension().string())
         return InitError(strprintf(_("Wallet %s resides outside data directory %s."), strWalletFileName.c_str(), strDataDir.c_str()));
 
 	// Make sure only a single Triangles process is using the data directory.
-    boost::filesystem::path pathLockFile = GetDataDir() / ".lock";
+    fs::path pathLockFile = GetDataDir() / ".lock";
     FILE* file = fopen(pathLockFile.string().c_str(), "a"); // empty lock file; created if it doesn't exist.
     if (file) fclose(file);
     static boost::interprocess::file_lock lock(pathLockFile.string().c_str());
@@ -594,7 +595,7 @@ bool AppInit2()
             return false;
     }
 
-    if (filesystem::exists(GetDataDir() / strWalletFileName))
+    if (fs::exists(GetDataDir() / strWalletFileName))
     {
         CDBEnv::VerifyResult r = bitdb.Verify(strWalletFileName, CWalletDB::Recover);
         if (r == CDBEnv::RECOVER_OK)
@@ -690,10 +691,10 @@ bool AppInit2()
         }
     } else { 
         string automatic_onion;
-        filesystem::path const hostname_path = GetDataDir(
+        fs::path const hostname_path = GetDataDir(
         ) / "onion" / "hostname";
         if (
-            !filesystem::exists(
+            !fs::exists(
                 hostname_path
             )
         ) {
@@ -891,13 +892,13 @@ bool AppInit2()
         exit(0);
     }
 
-    filesystem::path pathBootstrap = GetDataDir() / "bootstrap.dat";
-    if (filesystem::exists(pathBootstrap)) {
+    fs::path pathBootstrap = GetDataDir() / "bootstrap.dat";
+    if (fs::exists(pathBootstrap)) {
         uiInterface.InitMessage(_("Importing bootstrap blockchain data file."));
 
         FILE *file = fopen(pathBootstrap.string().c_str(), "rb");
         if (file) {
-            filesystem::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
+            fs::path pathBootstrapOld = GetDataDir() / "bootstrap.dat.old";
             LoadExternalBlockFile(file);
             RenameOver(pathBootstrap, pathBootstrapOld);
         }