fix: Linking issues for anomaly_detection-t TAP test

- Add special build rule in Makefile for anomaly_detection-t that includes:
  - $(OBJ) for global variables (GloVars, GloGATH)
  - -Wl,--allow-multiple-definition to allow test's main() to override ProxySQL's
  - ClickHouse client libraries (libclickhouse-cpp-lib.a, libzstdstatic.a, liblz4.a)
  - SQLite rembed library (libsqlite_rembed.a)
  - -lscram -lusual for PostgreSQL SCRAM support
- Add stub function SQLite3_Server_session_handler required by SQLite3_Server.cpp

Resolves compilation errors for anomaly_detection-t test.

test/tap/tests/Makefile

@@ -168,6 +168,9 @@ sh-%:
 	cp $(patsubst sh-%,%,$@) $(patsubst sh-%.sh,%,$@)
 	chmod +x $(patsubst sh-%.sh,%,$@)
 
+anomaly_detection-t: anomaly_detection-t.cpp $(TAP_LDIR)/libtap.so
+	$(CXX) -DEXCLUDE_TRACKING_VARAIABLES $< ../tap/SQLite3_Server.cpp -I$(CLICKHOUSE_CPP_IDIR) $(IDIRS) $(LDIRS) -L$(CLICKHOUSE_CPP_LDIR) -L$(LZ4_LDIR) $(OPT) $(OBJ) $(MYLIBSJEMALLOC) $(MYLIBS) $(STATIC_LIBS) $(CLICKHOUSE_CPP_LDIR)/libclickhouse-cpp-lib.a $(CLICKHOUSE_CPP_PATH)/contrib/zstd/zstd/libzstdstatic.a $(LZ4_LDIR)/liblz4.a $(SQLITE3_LDIR)/../libsqlite_rembed.a -lscram -lusual -Wl,--allow-multiple-definition -o $@
+
 %-t: %-t.cpp $(TAP_LDIR)/libtap.so
 	$(CXX) $< $(IDIRS) $(LDIRS) $(OPT) $(MYLIBS) $(STATIC_LIBS) -o $@
 

test/tap/tests/anomaly_detection-t.cpp

@@ -50,6 +50,17 @@ MYSQL* g_admin = NULL;
 class AI_Features_Manager;
 extern AI_Features_Manager *GloAI;
 
+// Forward declarations
+class MySQL_Session;
+typedef struct _PtrSize_t PtrSize_t;
+
+// Stub for SQLite3_Server_session_handler - required by SQLite3_Server.cpp
+// This test uses admin MySQL connection, so this is just a placeholder
+void SQLite3_Server_session_handler(MySQL_Session* sess, void* _pa, PtrSize_t* pkt) {
+	// This is a stub - the actual test uses MySQL admin connection
+	// The SQLite3_Server.cpp sets this as a handler but we don't use it
+}
+
 // ============================================================================
 // Helper Functions
 // ============================================================================