build: upgrade Echo framework from v4 to v5

- Update github.com/labstack/echo from v4 to v5
- Update github.com/labstack/echo-jwt to v5
- Update all Echo-related dependencies in go.sum

This upgrade provides:
- Better type safety with pointer-based context
- Improved WebSocket support with rwUnwrapper interface
- Updated middleware APIs (Logger → RequestLogger)
- Better HTTP server lifecycle management

go.mod

@@ -16,8 +16,8 @@ require (
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/jackc/pgx/v5 v5.8.0
 	github.com/klauspost/compress v1.18.4
-	github.com/labstack/echo-jwt/v4 v4.4.0
-	github.com/labstack/echo/v4 v4.15.1
+	github.com/labstack/echo-jwt/v5 v5.0.1
+	github.com/labstack/echo/v5 v5.0.4
 	github.com/nwaples/rardecode v1.1.3
 	github.com/pdfcpu/pdfcpu v0.11.1
 	github.com/pierrec/lz4/v4 v4.1.25
@@ -47,16 +47,11 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/kr/pretty v0.3.1 // indirect
-	github.com/labstack/gommon v0.4.2 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
-	github.com/mattn/go-colorable v0.1.14 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.20 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
-	github.com/valyala/bytebufferpool v1.0.0 // indirect
-	github.com/valyala/fasttemplate v1.2.2 // indirect
 	github.com/xyproto/randomstring v1.2.0 // indirect
 	golang.org/x/image v0.36.0 // indirect
 	golang.org/x/net v0.51.0 // indirect