Reorganize testing infrastructure and fix Oracle cursor loop syntax

Major changes:
- Fix cursor loop syntax in 04_import_comenzi.sql using BULK COLLECT pattern
- Remove obsolete test scripts (apply_fix.py, check_*.py, debug_functions.py, test_*.py)
- Add comprehensive README.md files for api/ and api/tests/ directories
- Keep only essential testing scripts (final_validation.py, test_syntax.py)
- Update PRD.md with latest project status

🤖 Generated with [Claude Code](https://claude.ai/code)

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

api/tests/test_syntax.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+"""
+Test script to check package compilation errors
+"""
+
+import os
+import oracledb
+from dotenv import load_dotenv
+
+load_dotenv()
+
+def check_compilation_errors():
+    """Check for compilation errors in the package"""
+    
+    user = os.environ['ORACLE_USER']
+    password = os.environ['ORACLE_PASSWORD']
+    dsn = os.environ['ORACLE_DSN']
+    
+    try:
+        oracledb.init_oracle_client()
+    except:
+        pass
+        
+    try:
+        with oracledb.connect(user=user, password=password, dsn=dsn) as conn:
+            with conn.cursor() as cursor:
+                
+                # Check for compilation errors
+                cursor.execute("""
+                    SELECT line, position, text, name
+                    FROM user_errors 
+                    WHERE name = 'PACK_IMPORT_COMENZI'
+                    ORDER BY sequence
+                """)
+                
+                errors = cursor.fetchall()
+                if errors:
+                    print("🔴 Compilation Errors:")
+                    for err in errors:
+                        print(f"Line {err[0]}, Position {err[1]}: {err[2]}")
+                else:
+                    print("✅ No compilation errors found")
+                    
+                # Check package status
+                cursor.execute("""
+                    SELECT object_name, status, object_type
+                    FROM user_objects 
+                    WHERE object_name = 'PACK_IMPORT_COMENZI'
+                """)
+                
+                status = cursor.fetchall()
+                for obj in status:
+                    print(f"📦 {obj[2]}: {obj[0]} - Status: {obj[1]}")
+                
+    except Exception as e:
+        print(f"❌ Error: {e}")
+
+if __name__ == "__main__":
+    check_compilation_errors()