feat(messages): implement integrated chat with voice/calls and tidy root go module

Add Discord-like messaging APIs, websocket realtime, smart suggestions, password vault flows, semantic indexing integration, and new /app/messages UI.

Add typing indicators, advanced message search filters, voice notes, browser-local optional transcription, and WebRTC call signaling (offer/answer/ice/hangup).

Clean root go.mod via go mod tidy and remove stale root go.sum.

backend/go.mod

@@ -3,20 +3,23 @@ module github.com/trackeep/backend
 go 1.24.0
 
 require (
+	github.com/PuerkitoBio/goquery v1.11.0
 	github.com/chromedp/chromedp v0.9.3
 	github.com/gin-gonic/gin v1.9.1
+	github.com/go-redis/redis/v8 v8.11.5
 	github.com/gocolly/colly/v2 v2.3.0
 	github.com/golang-jwt/jwt/v5 v5.3.0
+	github.com/gorilla/websocket v1.5.3
 	github.com/joho/godotenv v1.5.1
 	github.com/pquerna/otp v1.5.0
 	golang.org/x/crypto v0.47.0
+	golang.org/x/net v0.48.0
 	golang.org/x/oauth2 v0.17.0
 	gorm.io/driver/postgres v1.5.4
 	gorm.io/gorm v1.25.5
 )
 
 require (
-	github.com/PuerkitoBio/goquery v1.11.0 // indirect
 	github.com/andybalholm/cascadia v1.3.3 // indirect
 	github.com/antchfx/htmlquery v1.3.5 // indirect
 	github.com/antchfx/xmlquery v1.5.0 // indirect
@@ -34,7 +37,6 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.14.0 // indirect
-	github.com/go-redis/redis/v8 v8.11.5 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
 	github.com/gobwas/httphead v0.1.0 // indirect
 	github.com/gobwas/pool v0.2.1 // indirect
@@ -65,7 +67,6 @@ require (
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.11 // indirect
 	golang.org/x/arch v0.3.0 // indirect
-	golang.org/x/net v0.48.0 // indirect
 	golang.org/x/sys v0.40.0 // indirect
 	golang.org/x/text v0.33.0 // indirect
 	google.golang.org/appengine v1.6.8 // indirect