security: deep audit fixes — error leak prevention, DOMPurify XSS guard, mutex race fix, i18n parity, HMAC warning

- [C-1] Fix sync.Mutex copy in guard.GuardStats (go vet race condition)
- [C-2] Replace 3x raw err.Error() HTTP leaks with generic messages (tenant_handlers, ws_transport, immune)
- [M-1] Add isomorphic-dompurify to LegalPage and AIAssistant (XSS defense-in-depth)
- [M-4] Add swaggo/swag dependency for Swagger docs
- [L-4] Add slog.Warn for hardcoded dev HMAC key in tpmaudit
- [L-5] Add 2 missing i18n keys (nav.contacts, nav.start_free) — 365/365 parity

go.sum

@@ -1,3 +1,9 @@
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@@ -20,6 +26,7 @@ github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd h1:vy0G
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@@ -81,6 +105,7 @@ github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc
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@@ -98,11 +123,14 @@ github.com/spf13/cast v1.7.1 h1:cuNEagBQEHWN1FnbGEjCXL2szYEXqfJPbP2HNUaca9Y=
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