Fix: Make CUSTOM_TEMPLATES_DIR configurable again

Resolves issue #1484 where CUSTOM_TEMPLATES_DIR configuration was
being ignored. The setting was previously removed from ServerConfig
and hardcoded as a constant, preventing users from customizing the
templates directory location.

Changes:
- Added CUSTOM_TEMPLATES_DIR field to StorageConfig in common.py
- Updated settings.py to use STORAGE_CONFIG.CUSTOM_TEMPLATES_DIR
- Updated paths.py to use configurable value in version output

Users can now configure the custom templates directory via:
- ArchiveBox.conf: CUSTOM_TEMPLATES_DIR = ./custom_templates
- Environment variable: export CUSTOM_TEMPLATES_DIR=/path/to/templates
- Defaults to DATA_DIR/user_templates if not configured

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Nick Sweeting <pirate@users.noreply.github.com>

archivebox/config/common.py

@@ -66,6 +66,10 @@ class StorageConfig(BaseConfigSet):
     # should not be a remote/network/FUSE mount for speed reasons, otherwise extractors will be slow
     LIB_DIR: Path = Field(default=CONSTANTS.DEFAULT_LIB_DIR)
 
+    # CUSTOM_TEMPLATES_DIR allows users to override default templates
+    # defaults to DATA_DIR / 'user_templates' but can be configured
+    CUSTOM_TEMPLATES_DIR: Path = Field(default=CONSTANTS.CUSTOM_TEMPLATES_DIR)
+
     OUTPUT_PERMISSIONS: str = Field(default="644")
     RESTRICT_FILE_NAMES: str = Field(default="windows")
     ENFORCE_ATOMIC_WRITES: bool = Field(default=True)

archivebox/config/paths.py

@@ -261,7 +261,7 @@ def get_data_locations():
 def get_code_locations():
     from archivebox.config import CONSTANTS
     from archivebox.config.common import STORAGE_CONFIG
-    
+
     return benedict({
         'PACKAGE_DIR': {
             'path': (PACKAGE_DIR).resolve(),
@@ -274,9 +274,9 @@ def get_code_locations():
             'is_valid': os.access(CONSTANTS.STATIC_DIR, os.R_OK) and os.access(CONSTANTS.STATIC_DIR, os.X_OK),                                                # read + list
         },
         'CUSTOM_TEMPLATES_DIR': {
-            'path': CONSTANTS.CUSTOM_TEMPLATES_DIR.resolve(),
-            'enabled': os.path.isdir(CONSTANTS.CUSTOM_TEMPLATES_DIR),
-            'is_valid': os.path.isdir(CONSTANTS.CUSTOM_TEMPLATES_DIR) and os.access(CONSTANTS.CUSTOM_TEMPLATES_DIR, os.R_OK),                                      # read
+            'path': STORAGE_CONFIG.CUSTOM_TEMPLATES_DIR.resolve(),
+            'enabled': os.path.isdir(STORAGE_CONFIG.CUSTOM_TEMPLATES_DIR),
+            'is_valid': os.path.isdir(STORAGE_CONFIG.CUSTOM_TEMPLATES_DIR) and os.access(STORAGE_CONFIG.CUSTOM_TEMPLATES_DIR, os.R_OK),                                      # read
         },
         'USER_PLUGINS_DIR': {
             'path': CONSTANTS.USER_PLUGINS_DIR.resolve(),