rename: kafka → samsa

Full project rename from kafka to samsa (after Gregor Samsa, who
woke one morning from uneasy dreams to find himself transformed).

- Module: github.com/metamorphosis-dev/kafka → samsa
- Binary: cmd/kafka/ → cmd/samsa/
- CSS: kafka.css → samsa.css
- UI: all 'kafka' product names, titles, localStorage keys → samsa
- localStorage keys: kafka-theme → samsa-theme, kafka-engines → samsa-engines
- OpenSearch: ShortName, LongName, description, URLs updated
- AGPL headers: 'kafka' → 'samsa'
- Docs, configs, examples updated
- Cache key prefix: kafka: → samsa:

internal/search/merge.go

@@ -1,4 +1,4 @@
-// kafka — a privacy-respecting metasearch engine
+// samsa — a privacy-respecting metasearch engine
 // Copyright (C) 2026-present metamorphosis-dev
 //
 // This program is free software: you can redistribute it and/or modify
@@ -21,7 +21,7 @@ import (
 	"net/url"
 	"strings"
 
-	"github.com/metamorphosis-dev/kafka/internal/contracts"
+	"github.com/metamorphosis-dev/samsa/internal/contracts"
 )
 
 // MergeResponses merges multiple compatible JSON responses.

internal/search/merge_test.go

@@ -4,7 +4,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/metamorphosis-dev/kafka/internal/contracts"
+	"github.com/metamorphosis-dev/samsa/internal/contracts"
 )
 
 func TestMergeResponses_DedupResultsAndSets(t *testing.T) {

internal/search/request_params.go

@@ -1,4 +1,4 @@
-// kafka — a privacy-respecting metasearch engine
+// samsa — a privacy-respecting metasearch engine
 // Copyright (C) 2026-present metamorphosis-dev
 //
 // This program is free software: you can redistribute it and/or modify

internal/search/response.go

@@ -1,4 +1,4 @@
-// kafka — a privacy-respecting metasearch engine
+// samsa — a privacy-respecting metasearch engine
 // Copyright (C) 2026-present metamorphosis-dev
 //
 // This program is free software: you can redistribute it and/or modify
@@ -127,7 +127,7 @@ func writeCSV(w http.ResponseWriter, resp SearchResponse) error {
 
 func writeRSS(w http.ResponseWriter, resp SearchResponse) error {
 	q := resp.Query
-	escapedTitle := xmlEscape("kafka search: " + q)
+	escapedTitle := xmlEscape("samsa search: " + q)
 	escapedDesc := xmlEscape("Search results for \"" + q + "\" - kafka")
 	escapedQueryTerms := xmlEscape(q)
 

internal/search/service.go

@@ -1,4 +1,4 @@
-// kafka — a privacy-respecting metasearch engine
+// samsa — a privacy-respecting metasearch engine
 // Copyright (C) 2026-present metamorphosis-dev
 //
 // This program is free software: you can redistribute it and/or modify
@@ -22,11 +22,11 @@ import (
 	"sync"
 	"time"
 
-	"github.com/metamorphosis-dev/kafka/internal/cache"
-	"github.com/metamorphosis-dev/kafka/internal/config"
-	"github.com/metamorphosis-dev/kafka/internal/contracts"
-	"github.com/metamorphosis-dev/kafka/internal/engines"
-	"github.com/metamorphosis-dev/kafka/internal/upstream"
+	"github.com/metamorphosis-dev/samsa/internal/cache"
+	"github.com/metamorphosis-dev/samsa/internal/config"
+	"github.com/metamorphosis-dev/samsa/internal/contracts"
+	"github.com/metamorphosis-dev/samsa/internal/engines"
+	"github.com/metamorphosis-dev/samsa/internal/upstream"
 )
 
 type ServiceConfig struct {

internal/search/service_test.go

@@ -6,8 +6,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/metamorphosis-dev/kafka/internal/contracts"
-	"github.com/metamorphosis-dev/kafka/internal/engines"
+	"github.com/metamorphosis-dev/samsa/internal/contracts"
+	"github.com/metamorphosis-dev/samsa/internal/engines"
 )
 
 // mockEngine is a test engine that returns a predefined response or error.

internal/search/types.go

@@ -1,4 +1,4 @@
-// kafka — a privacy-respecting metasearch engine
+// samsa — a privacy-respecting metasearch engine
 // Copyright (C) 2026-present metamorphosis-dev
 //
 // This program is free software: you can redistribute it and/or modify
@@ -16,7 +16,7 @@
 
 package search
 
-import "github.com/metamorphosis-dev/kafka/internal/contracts"
+import "github.com/metamorphosis-dev/samsa/internal/contracts"
 
 // Re-export the JSON contract types so the rest of the code can stay in the
 // `internal/search` namespace without creating an import cycle.