Add Loki and Sentinel utility classes for web API endpoints

- Implemented LokiUtils class with GET and POST endpoints for managing scripts, jobs, and payloads.
- Added SentinelUtils class with GET and POST endpoints for managing events, rules, devices, and notifications.
- Both classes include error handling and JSON response formatting.

loki/layouts/__init__.py

@@ -0,0 +1,45 @@
+"""
+Keyboard layout loader for Loki HID subsystem.
+Caches loaded layouts in memory.
+"""
+import json
+import os
+import logging
+
+from logger import Logger
+
+logger = Logger(name="loki.layouts", level=logging.DEBUG)
+
+_LAYOUT_DIR = os.path.dirname(os.path.abspath(__file__))
+_cache = {}
+
+
+def load(name: str = "us") -> dict:
+    """Load a keyboard layout by name. Returns char → (modifier, keycode) map."""
+    name = name.lower()
+    if name in _cache:
+        return _cache[name]
+
+    path = os.path.join(_LAYOUT_DIR, f"{name}.json")
+    if not os.path.isfile(path):
+        logger.warning("Layout '%s' not found, falling back to 'us'", name)
+        path = os.path.join(_LAYOUT_DIR, "us.json")
+        name = "us"
+        if name in _cache:
+            return _cache[name]
+
+    with open(path, "r") as f:
+        data = json.load(f)
+
+    _cache[name] = data
+    logger.debug("Loaded keyboard layout '%s' (%d chars)", name, len(data))
+    return data
+
+
+def available() -> list:
+    """List available layout names."""
+    layouts = []
+    for f in os.listdir(_LAYOUT_DIR):
+        if f.endswith(".json"):
+            layouts.append(f[:-5])
+    return sorted(layouts)

loki/layouts/us.json

@@ -0,0 +1,41 @@
+{
+    "a": [0, 4], "b": [0, 5], "c": [0, 6], "d": [0, 7],
+    "e": [0, 8], "f": [0, 9], "g": [0, 10], "h": [0, 11],
+    "i": [0, 12], "j": [0, 13], "k": [0, 14], "l": [0, 15],
+    "m": [0, 16], "n": [0, 17], "o": [0, 18], "p": [0, 19],
+    "q": [0, 20], "r": [0, 21], "s": [0, 22], "t": [0, 23],
+    "u": [0, 24], "v": [0, 25], "w": [0, 26], "x": [0, 27],
+    "y": [0, 28], "z": [0, 29],
+
+    "A": [2, 4], "B": [2, 5], "C": [2, 6], "D": [2, 7],
+    "E": [2, 8], "F": [2, 9], "G": [2, 10], "H": [2, 11],
+    "I": [2, 12], "J": [2, 13], "K": [2, 14], "L": [2, 15],
+    "M": [2, 16], "N": [2, 17], "O": [2, 18], "P": [2, 19],
+    "Q": [2, 20], "R": [2, 21], "S": [2, 22], "T": [2, 23],
+    "U": [2, 24], "V": [2, 25], "W": [2, 26], "X": [2, 27],
+    "Y": [2, 28], "Z": [2, 29],
+
+    "1": [0, 30], "2": [0, 31], "3": [0, 32], "4": [0, 33],
+    "5": [0, 34], "6": [0, 35], "7": [0, 36], "8": [0, 37],
+    "9": [0, 38], "0": [0, 39],
+
+    "!": [2, 30], "@": [2, 31], "#": [2, 32], "$": [2, 33],
+    "%": [2, 34], "^": [2, 35], "&": [2, 36], "*": [2, 37],
+    "(": [2, 38], ")": [2, 39],
+
+    "\n": [0, 40], "\r": [0, 40],
+    "\t": [0, 43],
+    " ": [0, 44],
+
+    "-": [0, 45], "_": [2, 45],
+    "=": [0, 46], "+": [2, 46],
+    "[": [0, 47], "{": [2, 47],
+    "]": [0, 48], "}": [2, 48],
+    "\\": [0, 49], "|": [2, 49],
+    ";": [0, 51], ":": [2, 51],
+    "'": [0, 52], "\"": [2, 52],
+    "`": [0, 53], "~": [2, 53],
+    ",": [0, 54], "<": [2, 54],
+    ".": [0, 55], ">": [2, 55],
+    "/": [0, 56], "?": [2, 56]
+}