Implement C++ daemon with CMake, Ninja build system

Created complete C++ implementation:
- Core library (client, errors, capabilities)
- Query engine (AST, builder, normalizer)
- Utilities (UUID generation, exponential backoff)
- SQLite adapter and connection pool
- Daemon server with security manager
- Unit, integration, and conformance tests

Build system:
- CMakeLists.txt with optional Conan dependencies
- Renamed build assistant to .cjs for ES module compatibility
- Fixed conanfile.txt format for Conan 2.x
- All tests passing, daemon runs successfully

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

dbal/cpp/src/query/ast.cpp

@@ -0,0 +1,57 @@
+#include <string>
+#include <vector>
+#include <memory>
+
+namespace dbal {
+namespace query {
+
+enum class NodeType {
+    Select,
+    Insert,
+    Update,
+    Delete,
+    Where,
+    Join,
+    OrderBy,
+    Limit
+};
+
+class ASTNode {
+public:
+    NodeType type;
+    std::string value;
+    std::vector<std::shared_ptr<ASTNode>> children;
+    
+    ASTNode(NodeType t, const std::string& v = "") : type(t), value(v) {}
+    
+    void addChild(std::shared_ptr<ASTNode> child) {
+        children.push_back(child);
+    }
+};
+
+class AST {
+public:
+    std::shared_ptr<ASTNode> root;
+    
+    AST() : root(nullptr) {}
+    explicit AST(std::shared_ptr<ASTNode> r) : root(r) {}
+    
+    std::string toString() const {
+        if (!root) return "";
+        return nodeToString(root);
+    }
+    
+private:
+    std::string nodeToString(const std::shared_ptr<ASTNode>& node) const {
+        if (!node) return "";
+        
+        std::string result = node->value;
+        for (const auto& child : node->children) {
+            result += " " + nodeToString(child);
+        }
+        return result;
+    }
+};
+
+}
+}