refactor!: port shell scripts to Python package

Bash scripts were untestable and duplicated device/LUKS/mount logic;
the lim/ package centralizes it behind one subprocess wrapper and a
YAML image catalog (single point of truth).

BREAKING CHANGE: scripts/*.sh removed. Use `lim --type <cmd>`; new
types mount/umount/single-boot/raid1-boot/lock/unlock/import/export
replace direct script calls. --extra is deprecated and ignored.

- distributions.yml + lim/catalog.py hold the image catalog (PyYAML)
- pytest suite: 102 tests with mocked subprocess (tests/unit) and a
  250-line max file-length guard (tests/lint)
- ruff strict (select ALL), GitHub Actions CI, Dependabot; Travis gone
- Makefile: install (symlink ~/.local/bin/lim) and test targets
- fixes over bash: SUDO_USER-aware chown, mmcblk/nvme partition paths,
  sha512 checksum support, whole-pipeline failure detection, blkid
  UUID fallback for pre-mounted images, conditional fstab seeding for
  PARTUUID/LABEL images, clean errors for missing binaries

lim/ui.py

@@ -0,0 +1,62 @@
+"""Colored console messages and interactive prompts."""
+
+import sys
+
+_USE_COLOR = sys.stdout.isatty()
+
+
+def _color(code: str) -> str:
+    return f"\033[{code}m" if _USE_COLOR else ""
+
+
+COLOR_RED = _color("31")
+COLOR_GREEN = _color("32")
+COLOR_YELLOW = _color("33")
+COLOR_BLUE = _color("34")
+COLOR_MAGENTA = _color("35")
+COLOR_CYAN = _color("36")
+COLOR_WHITE = _color("37")
+COLOR_RESET = _color("0")
+
+
+def message(color: str, tag: str, text: str) -> None:
+    print(f"{color}[{tag}]:{COLOR_RESET} {text}")
+
+
+def question(text: str) -> None:
+    message(COLOR_MAGENTA, "QUESTION", text)
+
+
+def info(text: str) -> None:
+    message(COLOR_BLUE, "INFO", text)
+
+
+def warning(text: str) -> None:
+    message(COLOR_YELLOW, "WARNING", text)
+
+
+def success(text: str) -> None:
+    message(COLOR_GREEN, "SUCCESS", text)
+
+
+def error(text: str) -> None:
+    message(COLOR_RED, "ERROR", text)
+
+
+def ask(prompt: str) -> str:
+    question(prompt)
+    return input().strip()
+
+
+def confirm(prompt: str) -> bool:
+    return ask(f"{prompt}(y/N)") == "y"
+
+
+def header() -> None:
+    print(
+        f"\n{COLOR_YELLOW}The\n"
+        "LINUX IMAGE MANAGER\n"
+        "is an administration tool designed from and for Kevin Veen-Birkenbach.\n\n"
+        "Licensed under GNU GENERAL PUBLIC LICENSE Version 3"
+        f"{COLOR_RESET}\n"
+    )