Consolidate backend: drop vendored APwhy, converge on goose + sqlc

Phase 0 cleanup verified end-to-end:

- Delete vendored APwhy runtime (cmd/apwhy, internal/apwhy) and the
  unwired copy (internal/api/server.go + static bundle + cloned
  internal/{storage,analytics,auth,rbac}) — ~7.5k lines of dead code.
- Keep Containr's native internal/gateway; move APwhy management
  routes under /api/v1/gateway/* so they stop colliding with the
  native /services paths. Fix handlers against the real schema:
  UUID ids via RETURNING, integer enabled flags, plan validation,
  service validate endpoint, unique-violation mapping.
- Port agents.go off GORM onto sqlc (sqlc/queries/agents.sql);
  drop gorm dependencies; fix sqlc schema drift (services.environment_id).
- Replace the SELECT 1 goose baseline with the real consolidated
  schema (52 tables) minus APwhy's parallel auth/RBAC objects;
  idempotent via IF NOT EXISTS / OR REPLACE / guarded DO blocks so it
  replays cleanly over legacy installs. Add a drop migration for the
  dead objects and delete the legacy filename-tracked migrations/
  loader, directory, and Dockerfile copy. Verified via cmd/migrate:
  fresh install 53 tables, legacy upgrade clean to 20260917000000.
- Canvas: add invisible React Flow handles to ServiceNode so inferred
  auto-connections stop emitting warning #008.
- Remove reactflow dep (superseded by @xyflow/react), test harness
  cmds, and legacy 0001_init.sql backups.

Authored By: TDvorak <[email protected]>

app/backend/go.mod

@@ -8,11 +8,9 @@ require (
 	github.com/gin-gonic/gin v1.9.1
 	github.com/go-playground/validator/v10 v10.30.1
 	github.com/go-redis/redis/v8 v8.11.5
-	github.com/go-sql-driver/mysql v1.9.3
 	github.com/golang-jwt/jwt/v5 v5.0.0
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/websocket v1.5.3
-	github.com/jackc/pgx/v5 v5.7.1
 	github.com/lib/pq v1.10.9
 	github.com/miekg/dns v1.1.72
 	github.com/pressly/goose/v3 v3.24.1
@@ -22,13 +20,9 @@ require (
 	github.com/sqlc-dev/pqtype v0.3.0
 	github.com/stretchr/testify v1.11.1
 	golang.org/x/crypto v0.47.0
-	gorm.io/driver/postgres v1.6.0
-	gorm.io/gorm v1.31.1
-	modernc.org/sqlite v1.39.0
 )
 
 require (
-	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/bytedance/sonic v1.9.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
@@ -40,7 +34,6 @@ require (
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/distribution/reference v0.6.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
-	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.12 // indirect
@@ -52,11 +45,6 @@ require (
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/jackc/pgpassfile v1.0.0 // indirect
-	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/puddle/v2 v2.2.2 // indirect
-	github.com/jinzhu/inflection v1.0.0 // indirect
-	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
@@ -68,13 +56,11 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/morikuni/aec v1.1.0 // indirect
-	github.com/ncruces/go-strftime v0.1.9 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/sagikazarmark/locafero v0.11.0 // indirect
 	github.com/sethvargo/go-retry v0.3.0 // indirect
 	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
@@ -95,7 +81,6 @@ require (
 	go.uber.org/multierr v1.11.0 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/arch v0.3.0 // indirect
-	golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b // indirect
 	golang.org/x/mod v0.31.0 // indirect
 	golang.org/x/net v0.49.0 // indirect
 	golang.org/x/sync v0.19.0 // indirect
@@ -106,7 +91,5 @@ require (
 	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	gotest.tools/v3 v3.5.2 // indirect
-	modernc.org/libc v1.66.3 // indirect
-	modernc.org/mathutil v1.7.1 // indirect
-	modernc.org/memory v1.11.0 // indirect
+	modernc.org/sqlite v1.39.0 // indirect
 )