feat: Geutebruck GeViScope/GeViSoft Action Mapping System - MVP

This MVP release provides a complete full-stack solution for managing action mappings
in Geutebruck's GeViScope and GeViSoft video surveillance systems.

## Features

### Flutter Web Application (Port 8081)
- Modern, responsive UI for managing action mappings
- Action picker dialog with full parameter configuration
- Support for both GSC (GeViScope) and G-Core server actions
- Consistent UI for input and output actions with edit/delete capabilities
- Real-time action mapping creation, editing, and deletion
- Server categorization (GSC: prefix for GeViScope, G-Core: prefix for G-Core servers)

### FastAPI REST Backend (Port 8000)
- RESTful API for action mapping CRUD operations
- Action template service with comprehensive action catalog (247 actions)
- Server management (G-Core and GeViScope servers)
- Configuration tree reading and writing
- JWT authentication with role-based access control
- PostgreSQL database integration

### C# SDK Bridge (gRPC, Port 50051)
- Native integration with GeViSoft SDK (GeViProcAPINET_4_0.dll)
- Action mapping creation with correct binary format
- Support for GSC and G-Core action types
- Proper Camera parameter inclusion in action strings (fixes CrossSwitch bug)
- Action ID lookup table with server-specific action IDs
- Configuration reading/writing via SetupClient

## Bug Fixes
- **CrossSwitch Bug**: GSC and G-Core actions now correctly display camera/PTZ head parameters in GeViSet
- Action strings now include Camera parameter: `@ PanLeft (Comment: "", Camera: 101028)`
- Proper filter flags and VideoInput=0 for action mappings
- Correct action ID assignment (4198 for GSC, 9294 for G-Core PanLeft)

## Technical Stack
- **Frontend**: Flutter Web, Dart, Dio HTTP client
- **Backend**: Python FastAPI, PostgreSQL, Redis
- **SDK Bridge**: C# .NET 8.0, gRPC, GeViSoft SDK
- **Authentication**: JWT tokens
- **Configuration**: GeViSoft .set files (binary format)

## Credentials
- GeViSoft/GeViScope: username=sysadmin, password=masterkey
- Default admin: username=admin, password=admin123

## Deployment
All services run on localhost:
- Flutter Web: http://localhost:8081
- FastAPI: http://localhost:8000
- SDK Bridge gRPC: localhost:50051
- GeViServer: localhost (default port)

Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

GeViSetEditor/GeViSetEditor.Core/Parsers/InPlaceConfigModifier.cs

@@ -0,0 +1,150 @@
+using System;
+using System.Text;
+using GeViSetEditor.Core.Models;
+
+namespace GeViSetEditor.Core.Parsers
+{
+    /// <summary>
+    /// Modifies configuration in-place to preserve binary structure
+    /// Safer approach for edit operations
+    /// </summary>
+    public class InPlaceConfigModifier
+    {
+        /// <summary>
+        /// Modify a node's value in the original data array
+        /// Only works for fixed-size types (boolean, integer)
+        /// </summary>
+        public bool ModifyNode(byte[] data, ConfigNode node, object newValue)
+        {
+            if (node == null || data == null)
+                return false;
+
+            switch (node.NodeType)
+            {
+                case "boolean":
+                    return ModifyBoolean(data, node, newValue);
+
+                case "integer":
+                    return ModifyInteger(data, node, newValue);
+
+                case "string":
+                    // Strings are variable length - can only modify if same length
+                    return ModifyString(data, node, newValue);
+
+                default:
+                    return false;
+            }
+        }
+
+        private bool ModifyBoolean(byte[] data, ConfigNode node, object newValue)
+        {
+            try
+            {
+                // Boolean structure: 01 <value>
+                // Value is at StartOffset + 1
+                int valueOffset = node.StartOffset + 1;
+
+                if (valueOffset >= data.Length)
+                    return false;
+
+                bool boolValue = Convert.ToBoolean(newValue);
+                data[valueOffset] = boolValue ? (byte)1 : (byte)0;
+
+                // Update node value
+                node.Value = boolValue;
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        private bool ModifyInteger(byte[] data, ConfigNode node, object newValue)
+        {
+            try
+            {
+                // Integer structure: 04 <int32_LE>
+                // Value is at StartOffset + 1
+                int valueOffset = node.StartOffset + 1;
+
+                if (valueOffset + 4 > data.Length)
+                    return false;
+
+                int intValue = Convert.ToInt32(newValue);
+                byte[] bytes = BitConverter.GetBytes(intValue);
+
+                Array.Copy(bytes, 0, data, valueOffset, 4);
+
+                // Update node value
+                node.Value = intValue;
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        private bool ModifyString(byte[] data, ConfigNode node, object newValue)
+        {
+            try
+            {
+                // String structure: 07 <len> <data>
+                // Original length at StartOffset + 1
+                int lengthOffset = node.StartOffset + 1;
+
+                if (lengthOffset >= data.Length)
+                    return false;
+
+                byte originalLength = data[lengthOffset];
+                string newString = newValue?.ToString() ?? "";
+                byte[] newBytes = Encoding.UTF8.GetBytes(newString);
+
+                // Can only modify if new string has same length
+                if (newBytes.Length != originalLength)
+                {
+                    Console.WriteLine($"  ⚠ Cannot modify string: length mismatch (original={originalLength}, new={newBytes.Length})");
+                    return false;
+                }
+
+                // Copy new string data
+                int dataOffset = lengthOffset + 1;
+                Array.Copy(newBytes, 0, data, dataOffset, newBytes.Length);
+
+                // Update node value
+                node.Value = newString;
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Check if a node can be modified in-place
+        /// </summary>
+        public bool CanModify(ConfigNode node, object newValue)
+        {
+            if (node == null)
+                return false;
+
+            switch (node.NodeType)
+            {
+                case "boolean":
+                case "integer":
+                    return true;
+
+                case "string":
+                    // String can only be modified if same length
+                    string currentStr = node.Value?.ToString() ?? "";
+                    string newStr = newValue?.ToString() ?? "";
+                    return Encoding.UTF8.GetByteCount(currentStr) == Encoding.UTF8.GetByteCount(newStr);
+
+                default:
+                    return false;
+            }
+        }
+    }
+}