Add AI translation for comments and video descriptions

Comments get a Translate button that calls the active LLM provider in Admin → AI
settings. Each commenter shows a small country flag inferred from their
video_views + profile_visits history (falls back to users.nationality); that
inferred country drives the language hint passed to the LLM so Portuguese
"Linda, linda, linda" translates to "Beautiful" instead of pass-through.

Description boxes get a line-paired translation grid: a shared Translate button
flips #vdbDescSplit into a two-column CSS grid where every source line sits
next to its translation on the same row. Backend splits by newline and asks
the LLM for a JSON map keyed by index so counts always match.

LlmLyricsService now has translate() + translateLines() with echo-retry (if the
model returns the input unchanged while source != target, retry once with a
stronger directive) and keeps the Ollama model resident via keep_alive=1h.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

routes/web.php

@@ -58,6 +58,7 @@ Route::get('/videos/{video}/lyrics/progress', [VideoController::class, 'lyricsPr
 Route::post('/videos/{video}/lyrics/save', [VideoController::class, 'saveLyrics'])->name('videos.lyrics.save')->middleware(['auth', 'throttle:30,1']);
 Route::delete('/videos/{video}/lyrics', [VideoController::class, 'deleteLyrics'])->name('videos.lyrics.delete')->middleware(['auth', 'throttle:20,1']);
 Route::post('/videos/{video}/share', [VideoController::class, 'recordShare'])->name('videos.recordShare');
+Route::post('/videos/{video}/description/translate', [VideoController::class, 'translateDescription'])->name('videos.description.translate')->middleware('throttle:30,1');
 Route::post('/videos/{video}/share/email', [VideoController::class, 'shareByEmail'])->name('videos.shareEmail')->middleware(['auth', 'throttle:10,1']);
 Route::post('/videos/{video}/share/members', [VideoController::class, 'shareWithMembers'])->name('videos.shareMembers')->middleware(['auth', 'throttle:20,1']);
 Route::get('/videos/{video}/og-image', [VideoController::class, 'ogImage'])->name('videos.ogImage');
@@ -137,6 +138,7 @@ Route::post('/profile-visits/{user}', [UserController::class, 'recordProfileVisi
 
 // Comment routes
 Route::get('/videos/{video}/comments', [CommentController::class, 'index'])->name('comments.index');
+Route::post('/comments/{comment}/translate', [CommentController::class, 'translate'])->name('comments.translate');
 Route::middleware(['auth', 'verified'])->group(function () {
     Route::post('/videos/{video}/comments', [CommentController::class, 'store'])->name('comments.store');
     Route::put('/comments/{comment}', [CommentController::class, 'update'])->name('comments.update');