refactor: migrate from Fiber to Echo framework

- Replace Fiber v2 with Echo v4 for better Go native HTTP server compatibility
- Update server.go: migrate all handlers and routing logic to Echo
- Update server_test.go: rewrite tests using httptest for Echo compatibility
- Modernize code: replace interface{} with any type alias
- Maintain API compatibility: all endpoints and response formats unchanged
- All tests passing: verified functionality integrity

Benefits:
- Better integration with Go standard library net/http
- Improved compatibility with Go native HTTP server
- Modern Go syntax usage
- Maintained backward compatibility

Author: 100gle

go.mod

@@ -1,73 +1,67 @@
 module github.com/100gle/wordcounter
 
-go 1.19
+go 1.23.0
+
+toolchain go1.24.4
 
 require (
 	github.com/gavv/httpexpect/v2 v2.15.0
-	github.com/jedib0t/go-pretty v4.3.0+incompatible
 	github.com/jedib0t/go-pretty/v6 v6.4.6
+	github.com/labstack/echo/v4 v4.13.4
 	github.com/spf13/cobra v1.7.0
 	github.com/xuri/excelize/v2 v2.7.1
 )
 
 require (
 	github.com/ajg/form v1.5.1 // indirect
-	github.com/andybalholm/brotli v1.0.5 // indirect
+	github.com/andybalholm/brotli v1.1.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fatih/color v1.15.0 // indirect
 	github.com/fatih/structs v1.1.0 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
-	github.com/google/uuid v1.3.0 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/hpcloud/tail v1.0.0 // indirect
 	github.com/imkira/go-interpol v1.1.0 // indirect
-	github.com/klauspost/compress v1.16.7 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
-	github.com/philhofer/fwd v1.1.2 // indirect
+	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/sanity-io/litter v1.5.5 // indirect
-	github.com/savsgio/dictpool v0.0.0-20221023140959-7bf2e61cea94 // indirect
-	github.com/savsgio/gotils v0.0.0-20230208104028-c358bd845dee // indirect
 	github.com/sergi/go-diff v1.3.1 // indirect
-	github.com/stretchr/testify v1.8.4 // indirect
-	github.com/tinylib/msgp v1.1.8 // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
-	github.com/valyala/fasthttp v1.48.0 // indirect
-	github.com/valyala/tcplisten v1.0.0 // indirect
+	github.com/valyala/fasthttp v1.51.0 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	github.com/yalp/jsonpath v0.0.0-20180802001716-5cc68e5049a0 // indirect
 	github.com/yudai/gojsondiff v1.0.0 // indirect
 	github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // indirect
+	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/fsnotify.v1 v1.4.7 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	moul.io/http2curl/v2 v2.3.0 // indirect
 )
 
 require (
-	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
-	github.com/go-openapi/errors v0.20.3 // indirect
-	github.com/go-openapi/strfmt v0.21.7 // indirect
-	github.com/gofiber/fiber/v2 v2.47.0
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/mattn/go-runewidth v0.0.14 // indirect
-	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/labstack/gommon v0.4.2 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect
-	github.com/oklog/ulid v1.3.1 // indirect
 	github.com/richardlehane/mscfb v1.0.4 // indirect
 	github.com/richardlehane/msoleps v1.0.3 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/valyala/fasttemplate v1.2.2 // indirect
 	github.com/xuri/efp v0.0.0-20220603152613-6918739fd470 // indirect
 	github.com/xuri/nfp v0.0.0-20220409054826-5e722a1d9e22 // indirect
-	go.mongodb.org/mongo-driver v1.11.3 // indirect
-	golang.org/x/crypto v0.11.0 // indirect
-	golang.org/x/net v0.12.0 // indirect
-	golang.org/x/sys v0.10.0 // indirect
-	golang.org/x/text v0.11.0 // indirect
+	golang.org/x/crypto v0.38.0 // indirect
+	golang.org/x/net v0.40.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.25.0 // indirect
 )