Add XigmaNAS log parser and tests

internal/parser/vendors/xigmanas/README.md

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+# Xigmanas Parser
+
+Parser for Xigmanas (FreeBSD-based NAS) system logs.
+
+## Supported Files
+
+- `xigmanas` - Main system log file with configuration and status information
+- `dmesg` - Kernel messages and hardware initialization information
+- SMART data from disk monitoring
+
+## Features
+
+This parser extracts the following information from Xigmanas logs:
+
+### System Information
+- Firmware version
+- System uptime
+- CPU model and specifications
+- Memory configuration
+- Hardware platform information
+
+### Storage Information
+- Disk models and serial numbers
+- Disk capacity and health status
+- SMART temperature readings
+
+### Hardware Configuration
+- CPU information
+- Memory modules
+- Storage devices
+
+## Detection Logic
+
+The parser detects Xigmanas format by looking for:
+- Files with "xigmanas", "system", or "dmesg" in their names
+- Content containing "XigmaNAS" or "FreeBSD" strings
+- SMART-related information in log content
+
+## Example Output
+
+The parser populates the following fields in AnalysisResult:
+- `Hardware.Firmware` - Firmware versions
+- `Hardware.CPUs` - CPU information
+- `Hardware.Memory` - Memory configuration
+- `Hardware.Storage` - Storage devices with SMART data
+- `Sensors` - Temperature readings from SMART data