ci: replace broken default workflows with compile/unit/integration CI

The two scaffold workflows (Python application / Python package) failed on
every PR: they installed deps from a non-existent requirements.txt, ran
flake8/pytest over the vendored yt_dlp fork (new syntax under the 3.8/3.9
matrix), and collected ad-hoc root scripts — notably test_ai.py, which is
an invalid pasted object dump (not Python).

- Remove python-app.yml / python-package.yml and the junk root scripts
  (test.py, test_ai.py, test_time.py)
- Add .github/workflows/ci.yml with three PR-check jobs:
  * compile     — py_compile every first-party .py (no deps)
  * unit        — pytest on pure logic (conanjurer_functions, constants)
  * integration — boot the Flask services and assert the X-Conjurer-Api-Key
                  auth contract (communication_subroutine + conjurer_musician)
- Add tests/ suite, pytest.ini (testpaths=tests) and conftest.py (sys.path)

Fixes surfaced by the compile gate / needed for the integration job:
- conjurer_librarian/search_bot.py + search_bot2.py: f-string reused the
  same quote ({item["exists"]}) -> SyntaxError on Python < 3.12
- conjurer_musician/media_search_functions.py: made import-safe
  (env-overridable paths, lazy DB load / mkdir) so the service can be
  imported and tested off the Pi

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

conjurer_musician/media_search_functions.py

@@ -1,24 +1,44 @@
 #!/usr/bin/env python3
-import argparse
+"""Share-list search/publish helpers for the musician service.
+
+Paths are environment-overridable and the share database / directory are
+accessed lazily, so importing this module has no side effects (the previous
+version ran ``SHARE_DIR.mkdir()`` and read the JSON DB at import time, which
+crashed on any host without the Pi's ``/var/www`` / ``/var/log`` layout — and
+made the service untestable).
+"""
 import json
 import os
-import sys
 import uuid
 from pathlib import Path
 
-# CONFIGURATION
-JSON_DB        = '/var/log/share_scan.json'
-SHARE_DIR      = Path('/var/www/html/share')
-BASE_URL       = 'https://czernobog.pl/share'
+# CONFIGURATION (env-overridable)
+JSON_DB = os.getenv("CONJURER_SHARE_DB", "/var/log/share_scan.json")
+SHARE_DIR = Path(os.getenv("CONJURER_SHARE_DIR", "/var/www/html/share"))
+BASE_URL = os.getenv("CONJURER_SHARE_BASE_URL", "https://czernobog.pl/share")
+
+_entries_cache = None
+
+
+def _ensure_share_dir():
+    SHARE_DIR.mkdir(parents=True, exist_ok=True)
 
-# Ensure share directory exists
-SHARE_DIR.mkdir(parents=True, exist_ok=True)
 
 def load_db():
-    with open(JSON_DB) as f:
-        return json.load(f)['entries']
+    """Load share entries, returning [] when the DB is missing/corrupt."""
+    try:
+        with open(JSON_DB) as handle:
+            return json.load(handle).get("entries", [])
+    except (FileNotFoundError, json.JSONDecodeError):
+        return []
+
+
+def _entries():
+    global _entries_cache
+    if _entries_cache is None:
+        _entries_cache = load_db()
+    return _entries_cache
 
-ENTRIES = load_db()
 
 def relevancy(path, keywords):
     score = 0
@@ -28,17 +48,20 @@ def relevancy(path, keywords):
             score += low.count(kw.lower())
     return score
 
+
 def find_matches(count, keywords):
     scored = []
-    for e in ENTRIES:
-        score = relevancy(e['path'], keywords)
+    for entry in _entries():
+        score = relevancy(entry["path"], keywords)
         if score > 0:
-            scored.append((score, e['path']))
+            scored.append((score, entry["path"]))
     scored.sort(reverse=True, key=lambda x: x[0])
     result = [p for _, p in scored]
     return result[:count]
 
+
 def publish(paths):
+    _ensure_share_dir()
     urls = []
     for path in paths:
         token = uuid.uuid4().hex
@@ -49,4 +72,3 @@ def publish(paths):
             pass
         urls.append(f"{BASE_URL}/{token}")
     return urls
-