Fix install + admin bugs reported in issue #169

Addresses the five bugs found on master (6e139a1b) during a fresh
Docker install and admin testing:

1. Missing `details` column in gold_fin_log (HTTP 500 on finishing
   construction with gold, buying Gold Club, admin giving gold):
   - Add `details varchar(255)` to the gold_fin_log schema, matching
     every INSERT and the a2b2.php reader that already use it.
   - Fix the broken positional INSERT in Logging::goldFinLog() (it sent
     3 values for a 7-column table) which 500'd on the same gold path.

2. Admin "View Player Info" fatal error: `<? php` -> `<?php` in
   Admin/Templates/playerinfo.tpl.

3. "Reset Server" leaving the DB corrupted (Duplicate key name
   'idx_ft_bonus_xy'): move the croppers indexes inline into the
   CREATE TABLE IF NOT EXISTS so structure recreation is idempotent,
   and add `croppers` to the reset truncate list.

4. Install wizard crash on failed DB connection (mysqli_error(false)):
   use mysqli_connect_error() and show a friendly, actionable message
   (incl. the Docker "db" hostname hint).

5. PHP exposing errors/stack traces to end users: ship a production
   php.ini baseline + docker/php/zz-travianz.ini that turns off
   display_errors and logs to stderr instead.

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

Dockerfile

@@ -23,6 +23,11 @@ RUN docker-php-ext-configure gd --with-freetype --with-jpeg \
 # Enable Apache modules
 RUN a2enmod rewrite headers
 
+# Use the production PHP configuration as a baseline, then apply our overrides
+# so that errors are hidden from end users and logged server-side instead.
+RUN cp "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini"
+COPY docker/php/zz-travianz.ini "$PHP_INI_DIR/conf.d/zz-travianz.ini"
+
 # Set working directory
 WORKDIR /var/www/html