feat: add recording sharing and community features

Backend Changes:
- Added original_recording_id field to sexy_recordings table to track duplicates
- Added indexes for original_recording_id and public fields
- Implemented /sexy/community-recordings endpoint to list public shared recordings
- Implemented /sexy/recordings/:id/duplicate endpoint to duplicate community recordings
- Community recordings filtered by status=published AND public=true
- Duplication creates a private draft copy for the current user

Frontend Changes:
- Added leaderboard and profile quick links to play view header
- Added navigation buttons for better UX on play page
- Added translations: my_profile, anonymous, load_more

Database Schema:
- ALTER TABLE sexy_recordings ADD COLUMN original_recording_id uuid
- Created foreign key and indexes for efficient queries

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/frontend/src/lib/i18n/locales/en.ts

@@ -20,6 +20,9 @@ export default {
 		open: "Open",
 		yes: "Yes",
 		no: "No",
+		my_profile: "My Profile",
+		anonymous: "Anonymous",
+		load_more: "Load More",
 	},
 	header: {
 		home: "Home",

packages/frontend/src/routes/play/+page.svelte

@@ -437,9 +437,29 @@ onMount(() => {
                 >
                     {$_("play.title")}
                 </h1>
-                <p class="text-lg text-muted-foreground mb-10">
+                <p class="text-lg text-muted-foreground mb-6">
                     {$_("play.description")}
                 </p>
+                <div class="flex justify-center gap-3 mb-10">
+                    <Button
+                        variant="outline"
+                        size="sm"
+                        href="/leaderboard"
+                        class="border-primary/30 hover:bg-primary/10"
+                    >
+                        <span class="icon-[ri--trophy-line] w-4 h-4 mr-2"></span>
+                        {$_("gamification.leaderboard")}
+                    </Button>
+                    <Button
+                        variant="outline"
+                        size="sm"
+                        href="/me"
+                        class="border-primary/30 hover:bg-primary/10"
+                    >
+                        <span class="icon-[ri--user-line] w-4 h-4 mr-2"></span>
+                        {$_("common.my_profile")}
+                    </Button>
+                </div>
                 <div class="flex justify-center gap-4 items-center">
                     <Button
                         size="lg"