refactor(sponsor-panel): migrate from raw SQL to GORM (#1183) * refactor(sponsor-panel): rewrite models with GORM tags and helpers Replace raw pgxpool structs and SQL helper functions with GORM-tagged models. Rename User to PanelUser to avoid collision with internal/models. All DB helpers now take *gorm.DB instead of context + *pgxpool.Pool. Add TableName() methods and PanelModels() for AutoMigrate. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * refactor(sponsor-panel): remove raw SQL migrations GORM AutoMigrate replaces hand-written CREATE TABLE statements and ALTER TABLE migrations. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * refactor(sponsor-panel): swap pgxpool for gorm.DB in server Replace pgxpool.Pool with gorm.DB on Server struct. Use slog-gorm for structured logging and gorm-prometheus for database metrics. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * refactor(sponsor-panel): update oauth handlers to use GORM Replace s.pool with s.db, update function signatures, rename User to PanelUser, and cast user.ID to int for session compatibility. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * refactor(sponsor-panel): update patreon oauth to use GORM Replace s.pool with s.db, rename User to PanelUser, cast user.ID to int for session storage. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * refactor(sponsor-panel): update handlers to use GORM Replace s.pool with s.db for createLogoSubmission call. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * refactor(sponsor-panel): update sync sponsors to use GORM Replace pgxpool.Pool with gorm.DB in syncSponsors and startSyncLoop. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * feat(sponsor-panel): add index drop tool for GORM migration One-shot tool to drop old hand-created indexes and constraints so GORM AutoMigrate can recreate them with its own naming scheme. Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * build(deps): add slog-gorm and gorm-prometheus dependencies Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso * chore: update templ generated code to v0.3.1001 Signed-off-by: Xe Iaso * docs(sponsor-panel): add GORM migration implementation plan Assisted-by: Claude Opus 4.6 via Claude Code Signed-off-by: Xe Iaso --------- Signed-off-by: Xe Iaso