Roadmap 0.10, Performance roadmap — wave 3

`PERF.62` Server: the opcache interned-strings buffer is full and the cache restarts during the day

Platform
Decision Time

Measured: opcache interned strings 8.0 of 8.0 MB used (70,128 strings), oom_restarts 1 at 20:11 UTC today on a cache started 01:58; 1,195 scripts, 54 of 128 MB. After each restart every PHP file of every vhost recompiles (CadCraft alone 379 scripts / 33 MB): a CPU spike and slow first requests several times a day. Change in /etc/php/8.3/apache2/conf.d/10-opcache.ini: opcache.interned_strings_buffer=32, opcache.memory_consumption=256, then apache2ctl graceful. Healthy otherwise: hit rate 99.94 %, realpath cache 14 % used, autoloader one is_file per class, .env parse 0.04 ms, bootstrap 2 to 3 ms, DB connect 0.8 ms.

Waits on: Owner: server-wide PHP setting (shared by about 80 vhosts), no functional risk.

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