refactor(ai-moderation): fix all 8 issues per review

- #2: Duplikasi contoh → single-source ALL_EXAMPLES array + formatExamples()
- #3: Hierarki evasion → Level 1 (Wajib Flag) vs Level 2 (Pilih Clean)
- #4: Dead code → remove duplicate PromptMode, cleanup
- #5: Sanitasi AI content → sanitizeAiContent() + CDATA wrapping for
      channel culture & user profile (prevents prompt injection)
- #6: Contoh personality → match actual XML format (<message>,
      <user_profile>, <content> tags instead of plain text)
- #7: Contoh invite link → example #29 added
- #8: 'Deskripsi selesai.' removed from stickerPrompt.ts
- Image analysis balance: teks = gambar (equal weight), no more bias
- Removed LGBT exclusion from SYSTEM_RULES
- Removed all template fallback language, enforce specific descriptions

services/discord-gateway/src/modules/ai-moderation/stickerPrompt.ts

@@ -142,6 +142,5 @@ export function buildGeneralImageVisionPrompt(
     ``,
     `Format jawaban: Deskripsi singkat 2-3 kalimat dalam Bahasa Indonesia.`,
     `Mulai dengan menyebutkan JENIS gambar (screenshot/foto/kartun/dokumen).`,
-    `Akhiri dengan "Deskripsi selesai."`,
   ].join("\n");
 }