Add API client and CDN manager implementation

- Introduced `ApiClient` class for handling API interactions, including authentication and resource management.
- Added `CDNManager` class for managing file uploads and downloads to/from a CDN.
- Implemented security features for encryption and decryption of sensitive data.
- Created supporting classes for credentials, user roles, and hardware information retrieval.
- Established constants for configuration and logging.

This commit lays the foundation for resource management and secure communication with the API and CDN services.

src/hardware_service.pyx

@@ -0,0 +1,99 @@
+import os
+import platform
+import subprocess
+
+import psutil
+cimport constants
+
+cdef str _CACHED_HW_INFO = None
+
+
+def _get_cpu():
+    try:
+        with open("/proc/cpuinfo") as f:
+            for line in f:
+                if "model name" in line.lower():
+                    return line.split(":")[1].strip()
+    except OSError:
+        pass
+    cdef str p = platform.processor()
+    if p:
+        return p
+    return platform.machine()
+
+
+def _get_gpu():
+    try:
+        result = subprocess.run(
+            ["lspci"], capture_output=True, text=True, timeout=5,
+        )
+        for line in result.stdout.splitlines():
+            if "VGA" in line:
+                parts = line.split(":")
+                if len(parts) > 2:
+                    return parts[2].strip()
+                return parts[-1].strip()
+    except (OSError, subprocess.TimeoutExpired, FileNotFoundError):
+        pass
+    try:
+        result = subprocess.run(
+            ["system_profiler", "SPDisplaysDataType"],
+            capture_output=True, text=True, timeout=5,
+        )
+        for line in result.stdout.splitlines():
+            if "Chipset Model" in line:
+                return line.split(":")[1].strip()
+    except (OSError, subprocess.TimeoutExpired, FileNotFoundError):
+        pass
+    return "unknown"
+
+
+def _get_drive_serial():
+    try:
+        for block in sorted(os.listdir("/sys/block")):
+            for candidate in [
+                f"/sys/block/{block}/device/vpd_pg80",
+                f"/sys/block/{block}/device/serial",
+                f"/sys/block/{block}/serial",
+            ]:
+                try:
+                    with open(candidate, "rb") as f:
+                        serial = f.read().strip(b"\x00\x14 \t\n\r\v\f").decode("utf-8", errors="ignore")
+                        if serial:
+                            return serial
+                except OSError:
+                    continue
+    except OSError:
+        pass
+    try:
+        result = subprocess.run(
+            ["ioreg", "-rd1", "-c", "IOPlatformExpertDevice"],
+            capture_output=True, text=True, timeout=5,
+        )
+        for line in result.stdout.splitlines():
+            if "IOPlatformSerialNumber" in line:
+                return line.split('"')[-2]
+    except (OSError, subprocess.TimeoutExpired, FileNotFoundError):
+        pass
+    return "unknown"
+
+
+cdef class HardwareService:
+
+    @staticmethod
+    cdef str get_hardware_info():
+        global _CACHED_HW_INFO
+
+        if _CACHED_HW_INFO is not None:
+            constants.log(<str>"Using cached hardware info")
+            return <str> _CACHED_HW_INFO
+
+        cdef str cpu = _get_cpu()
+        cdef str gpu = _get_gpu()
+        cdef str memory = str(psutil.virtual_memory().total // 1024)
+        cdef str drive_serial = _get_drive_serial()
+
+        cdef str res = f'CPU: {cpu}. GPU: {gpu}. Memory: {memory}. DriveSerial: {drive_serial}'
+        constants.log(<str>f'Gathered hardware: {res}')
+        _CACHED_HW_INFO = res
+        return res