Fix prefix URL routing for encoded CIDR notation

Change route from wildcard /prefix/* to explicit /prefix/{prefix}/{len}
to properly handle URL-encoded IPv6 addresses with CIDR notation.

- Separate prefix and length into individual path parameters
- Add prefixURL template function for generating correct links
- Remove url.QueryUnescape from handlers (chi handles decoding)

internal/server/handlers.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"net"
 	"net/http"
-	"net/url"
 	"runtime"
 	"sort"
 	"strconv"
@@ -736,21 +735,18 @@ func (s *Server) handleASDetailJSON() http.HandlerFunc {
 // handlePrefixDetailJSON returns prefix details as JSON
 func (s *Server) handlePrefixDetailJSON() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		// Get wildcard parameter (everything after /prefix/)
-		prefixParam := chi.URLParam(r, "*")
-		if prefixParam == "" {
-			writeJSONError(w, http.StatusBadRequest, "Prefix parameter is required")
+		// Get prefix and length from URL params
+		prefixParam := chi.URLParam(r, "prefix")
+		lenParam := chi.URLParam(r, "len")
+
+		if prefixParam == "" || lenParam == "" {
+			writeJSONError(w, http.StatusBadRequest, "Prefix and length parameters are required")
 
 			return
 		}
 
-		// URL decode the prefix parameter
-		prefix, err := url.QueryUnescape(prefixParam)
-		if err != nil {
-			writeJSONError(w, http.StatusBadRequest, "Invalid prefix parameter")
-
-			return
-		}
+		// Combine prefix and length into CIDR notation
+		prefix := prefixParam + "/" + lenParam
 
 		routes, err := s.db.GetPrefixDetailsContext(r.Context(), prefix)
 		if err != nil {
@@ -903,21 +899,18 @@ func (s *Server) handleASDetail() http.HandlerFunc {
 // handlePrefixDetail returns a handler that serves the prefix detail HTML page
 func (s *Server) handlePrefixDetail() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		// Get wildcard parameter (everything after /prefix/)
-		prefixParam := chi.URLParam(r, "*")
-		if prefixParam == "" {
-			http.Error(w, "Prefix parameter is required", http.StatusBadRequest)
+		// Get prefix and length from URL params
+		prefixParam := chi.URLParam(r, "prefix")
+		lenParam := chi.URLParam(r, "len")
+
+		if prefixParam == "" || lenParam == "" {
+			http.Error(w, "Prefix and length parameters are required", http.StatusBadRequest)
 
 			return
 		}
 
-		// URL decode the prefix parameter
-		prefix, err := url.QueryUnescape(prefixParam)
-		if err != nil {
-			http.Error(w, "Invalid prefix parameter", http.StatusBadRequest)
-
-			return
-		}
+		// Combine prefix and length into CIDR notation
+		prefix := prefixParam + "/" + lenParam
 
 		routes, err := s.db.GetPrefixDetailsContext(r.Context(), prefix)
 		if err != nil {

internal/server/routes.go

@@ -28,7 +28,7 @@ func (s *Server) setupRoutes() {
 
 	// AS and prefix detail pages
 	r.Get("/as/{asn}", s.handleASDetail())
-	r.Get("/prefix/*", s.handlePrefixDetail())
+	r.Get("/prefix/{prefix}/{len}", s.handlePrefixDetail())
 	r.Get("/prefixlength/{length}", s.handlePrefixLength())
 	r.Get("/prefixlength6/{length}", s.handlePrefixLength6())
 
@@ -45,7 +45,7 @@ func (s *Server) setupRoutes() {
 		r.Get("/stats", s.handleStats())
 		r.Get("/ip/{ip}", s.handleIPLookup())
 		r.Get("/as/{asn}", s.handleASDetailJSON())
-		r.Get("/prefix/*", s.handlePrefixDetailJSON())
+		r.Get("/prefix/{prefix}/{len}", s.handlePrefixDetailJSON())
 	})
 
 	s.router = r