feat(prospecting): add complete prospecting module for lead discovery and scoring

Migrates scanning pipeline from marketing-.lu-domains app into Orion module.
Supports digital (domain scan) and offline (manual capture) lead channels
with enrichment, scoring, campaign management, and interaction tracking.

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

app/modules/prospecting/models/interaction.py

@@ -0,0 +1,54 @@
+# app/modules/prospecting/models/interaction.py
+"""
+Interaction tracking for prospect follow-ups.
+
+Logs all touchpoints: calls, emails, meetings, visits, notes.
+"""
+
+import enum
+
+from sqlalchemy import Column, Date, Enum, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+
+from app.core.database import Base
+from models.database.base import TimestampMixin
+
+
+class InteractionType(str, enum.Enum):
+    NOTE = "note"
+    CALL = "call"
+    EMAIL_SENT = "email_sent"
+    EMAIL_RECEIVED = "email_received"
+    MEETING = "meeting"
+    VISIT = "visit"
+    SMS = "sms"
+    PROPOSAL_SENT = "proposal_sent"
+
+
+class InteractionOutcome(str, enum.Enum):
+    POSITIVE = "positive"
+    NEUTRAL = "neutral"
+    NEGATIVE = "negative"
+    NO_ANSWER = "no_answer"
+
+
+class ProspectInteraction(Base, TimestampMixin):
+    """A logged interaction with a prospect."""
+
+    __tablename__ = "prospect_interactions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    prospect_id = Column(Integer, ForeignKey("prospects.id", ondelete="CASCADE"), nullable=False, index=True)
+
+    interaction_type = Column(Enum(InteractionType), nullable=False)
+    subject = Column(String(255), nullable=True)
+    notes = Column(Text, nullable=True)
+    outcome = Column(Enum(InteractionOutcome), nullable=True)
+
+    next_action = Column(String(255), nullable=True)
+    next_action_date = Column(Date, nullable=True)
+
+    created_by_user_id = Column(Integer, nullable=False)
+
+    # Relationships
+    prospect = relationship("Prospect", back_populates="interactions")