refactor(security): move all database access into pkg/security/lookup

pkg/security no longer contains SQL. Every provider calls a store interface
from lookup, implemented by a procedure backend (Postgres stored procedures,
the default there) and a direct backend (dialect-driven SQL for postgres,
sqlite, mysql and mssql with configurable table and column names).

- add sectypes, lookup, lookup/{dialect,procedure,direct,backends,ddl,conformance}
- split totp and providers sub packages out of the core package
- replace SQLNames/TableNames/QueryMode with lookup.Config (see breaking_changes.md)
- direct backend now covers column/row security and API-key login
- move txsettings SQL to lookup.ApplyTxSettings; remove password.go
- move schema scripts under lookup/, add reference DDL per dialect
- add a shared conformance suite; run it on sqlite, and on Postgres in a
  podman/docker container (RESOLVESPEC_TEST_CONTAINERS=1)
- fix procedure schema bugs found on real Postgres: duplicate p_data
  parameter, JSON null arrays, expires_at timezone casts, passkey list
  GROUP BY, missing resolvespec_passkey_login; accept zone-less timestamps

pkg/security/composite.go

@@ -88,6 +88,14 @@ func (c *CompositeSecurityProvider) RefreshToken(ctx context.Context, refreshTok
 	return nil, fmt.Errorf("authenticator does not support token refresh")
 }
 
+// LoginWithAPIKey implements APIKeyLoginable if the authenticator supports it
+func (c *CompositeSecurityProvider) LoginWithAPIKey(ctx context.Context, rawKey string, claims map[string]any) (*LoginResponse, error) {
+	if l, ok := c.auth.(APIKeyLoginable); ok {
+		return l.LoginWithAPIKey(ctx, rawKey, claims)
+	}
+	return nil, fmt.Errorf("authenticator does not support API key login")
+}
+
 // ValidateToken implements Validatable if the authenticator supports it
 func (c *CompositeSecurityProvider) ValidateToken(ctx context.Context, token string) (bool, error) {
 	if validatable, ok := c.auth.(Validatable); ok {