MssqlMcp: Incorrect tool tags - 'List Tables' marked as destructive, 'Create Table' marked as read-only

## Problem

The MssqlMcp .NET server has incorrect tool tags that misrepresent the nature of operations:

**Current (incorrect) behavior:**
- `ListTables` is tagged as **destructive**
- `CreateTable` is tagged as **read-only**
- `DescribeTable` is tagged as **read-only** ✓ (correct)

**Expected behavior:**
- `ListTables` should be tagged as **read-only** (it only queries metadata via INFORMATION_SCHEMA or sys tables)
- `CreateTable` should be tagged as **destructive** or **write** (it modifies database schema)
- Other write operations (`InsertData`, `UpdateData`, `DropTable`) should also be reviewed for correct tagging

## Impact

This causes user confusion and may trigger unnecessary confirmations for safe read operations while failing to warn about actual schema modifications.

## Environment

- MssqlMcp version: Built from main branch (dotnet implementation)
- .NET 8.0
- MCP SDK: Official C# SDK

## Steps to Reproduce

1. Configure MssqlMcp server in Claude Desktop or VS Code
2. View available tools
3. Observe incorrect tags on `ListTables` (destructive) and `CreateTable` (read-only)

## Additional Context

The tool tags appear to be swapped or misconfigured in the tool definitions. `ListTables` performs a SELECT query on database metadata and should be completely safe/read-only.

Start by locating the MssqlMcp tool definitions for ListTables, CreateTable, DescribeTable, InsertData, UpdateData, and DropTable. Compare each tag with the operation it performs, then review the available tools in Claude Desktop or VS Code to confirm read operations do not appear destructive and schema-changing operations are appropriately marked.

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