feat: add appointments, campaigns, admin, storage, tests and various updates

- Add new routers: admin, appointments, campaigns
- Add storage service and logging config
- Add migrations directory and test suite with pytest config
- Add supabase_migration_features.sql
- Update models, dependencies, config, and existing routers
- Remove whatsapp_service (deleted)
- Update pyproject.toml and uv.lock dependencies

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/services/rag.py

@@ -7,7 +7,7 @@ import logging
 
 logger = logging.getLogger(__name__)
 
-RAG_SYSTEM_PROMPT = """You are a helpful AI assistant for {company_name}. 
+RAG_SYSTEM_PROMPT = """You are a helpful AI assistant for {company_name}.
 Your role is to answer questions based on the provided context from company documents.
 
 IMPORTANT RULES:
@@ -16,13 +16,20 @@ IMPORTANT RULES:
 3. Be concise and helpful
 4. Always maintain a professional, friendly tone
 5. If asked about topics completely outside the context, politely redirect to relevant topics
-
+{language_instruction}
 {custom_instructions}
 
 Context from knowledge base:
 {context}
 """
 
+LANGUAGE_NAMES = {
+    "en": "English", "fr": "French", "es": "Spanish", "de": "German",
+    "it": "Italian", "pt": "Portuguese", "ar": "Arabic", "zh": "Chinese",
+    "ja": "Japanese", "ko": "Korean", "ru": "Russian", "nl": "Dutch",
+    "tr": "Turkish", "pl": "Polish", "vi": "Vietnamese", "th": "Thai",
+}
+
 
 class RAGEngine:
     def __init__(self):
@@ -102,8 +109,15 @@ class RAGEngine:
             logger.warning(f"[RAG] No context found for query: '{query}' in collection '{collection_name}'")
 
         # Step 4: Build messages
+        lang_name = LANGUAGE_NAMES.get(language, "English") if language and language != "en" else ""
+        language_instruction = (
+            f"\n6. Respond in {lang_name}. Match the language of the user's message."
+            if lang_name else ""
+        )
+
         system_prompt = RAG_SYSTEM_PROMPT.format(
             company_name=chatbot_config.get("company_name", ""),
+            language_instruction=language_instruction,
             custom_instructions=chatbot_config.get("system_prompt") or "",
             context=context,
         )