Add owner-only logging and Brickset API call tracking

LIM configured no logging at all, so the instruction fetcher had no trail to follow. Adds a rotating file handler on the root logger plus two owner-only admin pages.

- Admin > Logs: filter by level, source and text; tracebacks kept with their error; auto-refresh, raw download, rotated-file browsing and rotate-now

- Admin > Logs > Brickset API calls: every outbound call recorded with method, params, caller, duration, result count and error, plus daily quota accounting (only getSets counts) and a comparison against getKeyUsageStats

- New owner concept (services/ownership.py): a single account, distinct from is_admin, since these pages expose other admins activity. Defaults to the first admin; flask owner show/set to change

- Services now log through module loggers; retention setting and pruning for call records

- New CLI: flask owner show/set, flask logs path/prune

- New table brickset_api_calls, created automatically at boot; LOG_* env vars, /data/logs in Docker

app/services/schema_upgrade.py

@@ -34,7 +34,10 @@ ADDITIVE_COLUMNS = {
 
 # Tables added by later versions. create_all() is not called at boot, so new
 # tables need an explicit (and idempotent) nudge.
-NEW_TABLES = ('app.models.instruction_fetch.InstructionFetchJob',)
+NEW_TABLES = (
+    'app.models.instruction_fetch.InstructionFetchJob',
+    'app.models.api_call.BricksetApiCall',
+)
 
 
 def ensure_schema(app):