panel v0.9.2 — public release

Self-hostable game server control panel: Go controller + agent, 26 game
modules, embedded web UI. One-line install via install.sh / install.ps1.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

controller/internal/db/migrations/017_pair_tokens_fk_cascade.sql

@@ -0,0 +1,23 @@
+-- 017_pair_tokens_fk_cascade.sql — fix the self-contradictory FK on
+-- pair_tokens.created_by.
+--
+-- Migration 006 declared:
+--     created_by BIGINT NOT NULL REFERENCES users(id) ON DELETE SET NULL
+-- which is impossible: ON DELETE SET NULL tries to write NULL into a NOT NULL
+-- column, so deleting an admin that had ever minted a pair token would fail
+-- with a not-null-violation instead of cleaning up the tokens.
+--
+-- Forward-safe fix: drop the old FK constraint and re-add it as ON DELETE
+-- CASCADE. Deleting a user now removes the (short-lived, mostly-expired) pair
+-- tokens they created, which is the sane behavior for onboarding tokens.
+--
+-- The constraint name from an inline column REFERENCES is auto-generated by
+-- Postgres as <table>_<column>_fkey. We drop it defensively with IF EXISTS so
+-- this migration is safe even if the name ever differed.
+
+ALTER TABLE pair_tokens
+    DROP CONSTRAINT IF EXISTS pair_tokens_created_by_fkey;
+
+ALTER TABLE pair_tokens
+    ADD CONSTRAINT pair_tokens_created_by_fkey
+        FOREIGN KEY (created_by) REFERENCES users(id) ON DELETE CASCADE;