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/docs/scoring.md

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+# Opportunity Scoring Model
+
+## Overview
+
+The scoring model assigns each prospect a score from 0-100 based on the opportunity potential for offering web services. Higher scores indicate better leads. The model supports two channels: **digital** (domain-based) and **offline** (in-person discovery).
+
+## Score Components — Digital Channel
+
+### Technical Health (Max 40 points)
+
+Issues that indicate immediate opportunities:
+
+| Issue | Points | Condition |
+|-------|--------|-----------|
+| No SSL | 15 | `uses_https = false` |
+| Very Slow | 15 | `performance_score < 30` |
+| Slow | 10 | `performance_score < 50` |
+| Moderate Speed | 5 | `performance_score < 70` |
+| Not Mobile Friendly | 10 | `is_mobile_friendly = false` |
+
+### Modernity / Stack (Max 25 points)
+
+Outdated technology stack:
+
+| Issue | Points | Condition |
+|-------|--------|-----------|
+| Outdated CMS | 15 | CMS is Drupal, Joomla, or TYPO3 |
+| Unknown CMS | 5 | No CMS detected but has website |
+| Legacy JavaScript | 5 | Uses jQuery without modern framework |
+| No Analytics | 5 | No Google Analytics or similar |
+
+### Business Value (Max 25 points)
+
+Indicators of business potential:
+
+| Factor | Points | Condition |
+|--------|--------|-----------|
+| Has Website | 10 | Active website exists |
+| Has E-commerce | 10 | E-commerce platform detected |
+| Short Domain | 5 | Domain name <= 15 characters |
+
+### Engagement Potential (Max 10 points)
+
+Ability to contact the business:
+
+| Factor | Points | Condition |
+|--------|--------|-----------|
+| Has Contacts | 5 | Any contact info found |
+| Has Email | 3 | Email address found |
+| Has Phone | 2 | Phone number found |
+
+## Score Components — Offline Channel
+
+Offline leads have a simplified scoring model based on the information captured during in-person encounters:
+
+| Scenario | Technical Health | Modernity | Business Value | Engagement | Total |
+|----------|-----------------|-----------|----------------|------------|-------|
+| No website at all | 30 | 20 | 20 | 0 | **70** (top_priority) |
+| Uses gmail/free email | +0 | +10 | +0 | +0 | +10 |
+| Met in person | +0 | +0 | +0 | +5 | +5 |
+| Has email contact | +0 | +0 | +0 | +3 | +3 |
+| Has phone contact | +0 | +0 | +0 | +2 | +2 |
+
+A business with no website met in person with contact info scores: 70 + 5 + 3 + 2 = **80** (top_priority).
+
+## Lead Tiers
+
+Based on the total score:
+
+| Tier | Score Range | Description |
+|------|-------------|-------------|
+| `top_priority` | 70-100 | Best leads, multiple issues or no website at all |
+| `quick_win` | 50-69 | Good leads, 1-2 easy fixes |
+| `strategic` | 30-49 | Moderate potential |
+| `low_priority` | 0-29 | Low opportunity |
+
+## Reason Flags
+
+Each score includes `reason_flags` that explain why points were awarded:
+
+```json
+{
+  "score": 78,
+  "reason_flags": ["no_ssl", "slow", "outdated_cms"],
+  "lead_tier": "top_priority"
+}
+```
+
+Common flags (digital):
+- `no_ssl` — Missing HTTPS
+- `very_slow` — Performance score < 30
+- `slow` — Performance score < 50
+- `not_mobile_friendly` — Fails mobile tests
+- `outdated_cms` — Using old CMS
+- `legacy_js` — Using jQuery only
+- `no_analytics` — No tracking installed
+
+Offline-specific flags:
+- `no_website` — Business has no website
+- `uses_gmail` — Uses free email provider
+- `met_in_person` — Lead captured in person (warm lead)
+
+## Customizing the Model
+
+The scoring logic is in `app/modules/prospecting/services/scoring_service.py`. You can adjust:
+
+1. **Point values** — Change weights for different issues
+2. **Thresholds** — Adjust performance score cutoffs
+3. **Conditions** — Add new scoring criteria
+4. **Tier boundaries** — Change score ranges for tiers