fix: remove 18 unused heavy deps — Docker image ~4GB → ~800MB

Removed packages never imported or only in try/except:
- crewai (pulls torch ~2GB), mem0ai, langgraph, langchain-*
- camel-tools, weasyprint, statsforecast (zero imports)
- pandas, paramiko, psycopg2-binary (zero imports in app/)
- pytest/factory-boy (testing only), celery-redbeat (workers only)

454 routes, 40/40 tests pass.

https://claude.ai/code/session_01W1rJthWDkasijTdXCfxVHs

salesflow-saas/backend/requirements.txt

@@ -3,82 +3,58 @@ fastapi==0.115.5
 uvicorn[standard]==0.32.1
 pydantic>=2.10.0,<3
 pydantic-settings>=2.10.1,<3
-pydantic-extra-types[phonenumbers]>=2.0.0  # Saudi phone validation (+966)
+pydantic-extra-types[phonenumbers]>=2.0.0
 python-multipart==0.0.12
 
 # === Database ===
 sqlalchemy==2.0.36
 asyncpg==0.30.0
-psycopg2-binary==2.9.10
 alembic==1.14.0
 pgvector==0.3.6
 
 # === AI / LLM Providers ===
-litellm>=1.74.0,<2           # httpx>=0.28 compatible (older litellm capped httpx<0.28)
-instructor>=1.14.0           # Structured LLM outputs via Pydantic models
+litellm>=1.74.0,<2
+instructor>=1.14.0
 groq==0.12.0
-openai>=2.8.0,<3             # litellm 1.8x+ requires openai>=2.8; mem0ai 1.x supports it
-langchain==0.3.28
-langchain-groq==0.2.1
-langchain-community==0.3.28
-langchain-anthropic==0.2.0
-langgraph==0.2.53
-crewai>=0.95.0,<1          # aligns with litellm/langchain stack; 0.80 pulled incompatible crewai-tools
-mem0ai>=1.0.0,<2             # 0.1.x capped openai<2; incompatible with current litellm
+openai>=2.8.0,<3
 
-# === Arabic NLP ===
-camel-tools>=1.5.0           # Arabic morphology, NER, dialect detection (NYU Abu Dhabi)
-pyarabic>=0.6.15             # Arabic text normalization, diacritics removal
+# === Arabic NLP (lightweight) ===
+pyarabic>=0.6.15
 
 # === WhatsApp Business API ===
-pywa>=3.0.0                  # Direct WhatsApp Cloud API (async, webhooks, templates)
-twilio==9.3.7                # Twilio fallback
+pywa>=3.0.0
+twilio==9.3.7
 
 # === Communication ===
 httpx>=0.28.1,<0.29.0
-resend>=2.0.0                # Transactional email API (free tier, FastAPI-native)
+resend>=2.0.0
 
 # === Saudi-specific ===
-hijridate>=2.4.0             # Hijri-Gregorian calendar (Umm al-Qura, official Saudi)
-phonenumbers>=8.13.0         # Saudi phone number validation and formatting
-
-# === PDF Generation (Arabic RTL) ===
-weasyprint>=60.0             # HTML/CSS to PDF with Arabic RTL support
+hijridate>=2.4.0
+phonenumbers>=8.13.0
 
 # === Security ===
-PyJWT[crypto]>=2.8.0         # JWT (replaces abandoned python-jose)
+PyJWT[crypto]>=2.8.0
 passlib[bcrypt]==1.7.4
 bcrypt>=4.0.1,<5
-slowapi>=0.1.9               # API rate limiting with Redis backend
+slowapi>=0.1.9
 
-# === Caching & Performance ===
+# === Caching ===
 redis==5.2.0
-fastapi-cache2>=0.2.1        # Response caching with Redis backend
-celery-redbeat>=2.2.0        # Dynamic Celery Beat scheduler (Redis-backed)
+fastapi-cache2>=0.2.1
 
 # === Monitoring & Logging ===
-sentry-sdk[fastapi]>=2.0.0   # Error tracking + performance monitoring
-prometheus-fastapi-instrumentator>=7.0.0  # Prometheus metrics
-structlog>=24.0.0            # Structured JSON logging with tenant context
-
-# === Testing ===
-pytest==8.3.4
-pytest-asyncio==0.24.0         # Async test support — pinned for CI stability
-pytest-cov==5.0.0              # Coverage reporting — pinned for stability
-factory-boy>=3.3.0           # Test data factories for SQLAlchemy models
-
-# === Forecasting ===
-statsforecast>=1.7.0         # Fast statistical time-series forecasting
+sentry-sdk[fastapi]>=2.0.0
+prometheus-fastapi-instrumentator>=7.0.0
+structlog>=24.0.0
 
 # === Data & Utilities ===
 beautifulsoup4==4.12.3
 lxml==5.3.0
 requests>=2.32.5,<3
 python-dateutil==2.9.0
-pandas==2.2.3
-numpy>=1.26.2,<2            # camel-tools requires numpy<2; langchain needs >=1.26.2 on Py3.12
+numpy>=1.26.2,<2
 python-decouple==3.8
-paramiko==3.5.0
 qrcode==8.0
 Pillow==11.0.0
 xmltodict==0.14.2