feat(linkedin): add prospect-wizard app with scraping and visualization

Add new LinkedIn prospect discovery tool with three main components:
- c4ai_discover.py for company and people scraping
- c4ai_insights.py for org chart and decision maker analysis
- Interactive graph visualization with company/people exploration

Features include:
- Configurable LinkedIn search and scraping
- Org chart generation with decision maker scoring
- Interactive network graph visualization
- Company similarity analysis
- Chat interface for data exploration

Requires: crawl4ai, openai, sentence-transformers, networkx

docs/apps/linkdin/schemas/company_card.json

@@ -0,0 +1,39 @@
+{
+  "name": "LinkedIn Company Card",
+  "baseSelector": "div.search-results-container ul[role='list'] > li",
+  "fields": [
+    {
+      "name": "handle",
+      "selector": "a[href*='/company/']",
+      "type": "attribute",
+      "attribute": "href"
+    },
+    {
+      "name": "profile_image",
+      "selector": "a[href*='/company/'] img",
+      "type": "attribute",
+      "attribute": "src"
+    },
+    {
+      "name": "name",
+      "selector": "span[class*='t-16'] a",
+      "type": "text"
+    },
+    {
+      "name": "descriptor",
+      "selector": "div[class*='t-black t-normal']",
+      "type": "text"
+    },
+    {
+      "name": "about",
+      "selector": "p[class*='entity-result__summary--2-lines']",
+      "type": "text"
+    },
+    {
+      "name": "followers",
+      "selector": "div:contains('followers')",
+      "type": "regex",
+      "pattern": "(\\d+)\\s*followers"
+    }
+  ]
+}

docs/apps/linkdin/schemas/people_card.json

@@ -0,0 +1,38 @@
+{
+  "name": "LinkedIn People Card",
+  "baseSelector": "li.org-people-profile-card__profile-card-spacing",
+  "fields": [
+    {
+      "name": "profile_url",
+      "selector": "a.eETATgYTipaVsmrBChiBJJvFsdPhNpulhPZUVLHLo",
+      "type": "attribute",
+      "attribute": "href"
+    },
+    {
+      "name": "name",
+      "selector": ".artdeco-entity-lockup__title .lt-line-clamp--single-line",
+      "type": "text"
+    },
+    {
+      "name": "headline",
+      "selector": ".artdeco-entity-lockup__subtitle .lt-line-clamp--multi-line",
+      "type": "text"
+    },
+    {
+      "name": "followers",
+      "selector": ".lt-line-clamp--multi-line.t-12",
+      "type": "text"
+    },
+    {
+      "name": "connection_degree",
+      "selector": ".artdeco-entity-lockup__badge .artdeco-entity-lockup__degree",
+      "type": "text"
+    },
+    {
+      "name": "avatar_url",
+      "selector": ".artdeco-entity-lockup__image img",
+      "type": "attribute",
+      "attribute": "src"
+    }
+  ]
+}