fix(config): resilient YAML loader (cp1252 fallback) + ASCII-only example

Cause
- v1.4.1's config.yaml.example had an em-dash (U+2014, 3-byte UTF-8 sequence)
  inside the skip_nsfw comment. When DSM File Station / classic Notepad
  re-saves the file, they convert it to a single 0x97 byte (Windows-1252
  em-dash) — which is invalid UTF-8 and crashes yaml.safe_load with
  UnicodeDecodeError, returning 500 on every GET / after PIN unlock.

Fix
- src/web/config_manager.load_config(): try utf-8 first; on
  UnicodeDecodeError, retry with cp1252 (which maps 0x97 → U+2014
  correctly so PyYAML accepts the text). Log a warning so the next
  save_config() normalizes the file back to UTF-8.
- config.yaml.example: replace em-dash with comma in the skip_nsfw comment
  so the canonical example is pure ASCII and cannot trigger this again.

Bump 1.4.1 -> 1.4.2 (patch — bugfix to a regression introduced by
1.4.1's own example file).

Verified
- 151 tests still green.
- Manual smoke: a YAML file containing raw 0x97 byte loads correctly
  via the cp1252 fallback, with warning logged. UTF-8 files unchanged.

For existing users hit by this on the NAS, the immediate workaround
is to remove the em-dash from their config.yaml's skip_nsfw comment
line (or just delete the comment entirely). After 1.4.2 the loader
handles it transparently.

config.yaml.example

@@ -26,7 +26,7 @@ download:
     - "video"
     - "gif"
   min_score: 10          # Minimum upvotes to download
-  skip_nsfw: false       # Set to true to skip NSFW posts (default: false — collect everything)
+  skip_nsfw: false       # Set to true to skip NSFW posts (default: false, collects everything)
   max_file_size_mb: 100  # Skip files larger than this
 
 rate_limit:

pyproject.toml

@@ -7,7 +7,7 @@ packages = ["src"]
 
 [project]
 name = "reddit-media-collector"
-version = "1.4.1"
+version = "1.4.2"
 description = "Self-hosted media collector for Reddit with Immich integration"
 readme = "README.md"
 requires-python = ">=3.11"

src/web/config_manager.py

@@ -1,5 +1,6 @@
 """Configuration file manager for CRUD operations."""
 
+import logging
 import os
 from pathlib import Path
 from typing import Any
@@ -8,14 +9,33 @@ import yaml
 
 CONFIG_PATH = Path(os.environ.get("RMC_CONFIG_PATH", str(Path(__file__).parent.parent.parent / "config.yaml")))
 
+_log = logging.getLogger(__name__)
+
 
 def load_config() -> dict[str, Any]:
-    """Load configuration from YAML file."""
+    """Load configuration from YAML file.
+
+    Tries UTF-8 first (canonical); falls back to cp1252 (Windows-1252) if
+    DSM File Station, classic Notepad or a similar editor re-saved the file
+    with a legacy single-byte encoding. cp1252 maps bytes like 0x97 to the
+    proper Unicode em-dash so PyYAML accepts the text. The next
+    save_config() will normalize the file back to UTF-8.
+    """
     if not CONFIG_PATH.exists():
         return {"targets": {"subreddits": [], "users": []}}
 
-    with open(CONFIG_PATH, encoding="utf-8") as f:
-        return yaml.safe_load(f) or {}
+    try:
+        with open(CONFIG_PATH, encoding="utf-8") as f:
+            return yaml.safe_load(f) or {}
+    except UnicodeDecodeError as e:
+        _log.warning(
+            "%s contains non-UTF-8 bytes (%s); falling back to cp1252. "
+            "Next save_config() will normalize the file to UTF-8.",
+            CONFIG_PATH,
+            e,
+        )
+        with open(CONFIG_PATH, encoding="cp1252") as f:
+            return yaml.safe_load(f) or {}
 
 
 def save_config(config: dict[str, Any]) -> None: