docs: add Tailscale MySQL middleware guide

cai

2026-07-02 758dafeab0836ad6a8959bb3fefcdcaeb69a67d8

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artifact,path,sha256
raw_input,exp-data/raw/RUN-20260601-PROJA-VOLUME-SPIKE-002/volume_spike_input.csv,dc7d7306fb15b2747c65c95054d3625ced4595d4e8ab1750db9e5529571600fe