docs: update README and SKILL.md for ScrapeCreators TikTok API

Replace all Apify references with ScrapeCreators. Key points:
- No subscription required (was $5/mo with Apify)
- 100 free credits, pay-as-you-go after
- SCRAPECREATORS_API_KEY replaces APIFY_API_TOKEN
- Backwards compatible: APIFY_API_TOKEN still works as fallback

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

README.md

@@ -4,7 +4,7 @@
 
 **New in V2.7 — TikTok as a source:**
 
-TikTok is now the 7th signal source. Search any topic and get viral TikTok videos with views, likes, hashtags, and extracted captions — scored and ranked alongside Reddit, X, and YouTube. Powered by [Apify](https://apify.com) with a BYO API key ($5/month free credits, no credit card). [Details below.](#whats-new-in-v27)
+TikTok is now the 7th signal source. Search any topic and get viral TikTok videos with views, likes, hashtags, and extracted captions — scored and ranked alongside Reddit, X, and YouTube. Powered by [ScrapeCreators](https://scrapecreators.com) - 100 free credits, pay-as-you-go after that, no subscription required. [Details below.](#whats-new-in-v27)
 
 **New in V2.5 - dramatically better results:**
 
@@ -33,7 +33,7 @@ mkdir -p ~/.config/last30days
 cat > ~/.config/last30days/.env << 'EOF'
 OPENAI_API_KEY=sk-...      # optional if using `codex login`
 XAI_API_KEY=xai-...        # optional - cookie auth is default for X search
-APIFY_API_TOKEN=apify_...  # optional - for TikTok (free $5/mo at apify.com)
+SCRAPECREATORS_API_KEY=sc_...  # optional - for TikTok (100 free credits at scrapecreators.com, no subscription)
 EOF
 chmod 600 ~/.config/last30days/.env
 ```
@@ -954,14 +954,12 @@ Search "Leah Halton" and TikTok is the primary signal:
 - @looooooooch: 108.8M views — her "Recreation #Inverted" viral hit
 - @allyouseeisai: 17.7M views — AI-generated content of her
 
-**Powered by [Apify](https://apify.com)** — sign up for free ($5/month credits, no credit card) and add your token:
+**Powered by [ScrapeCreators](https://scrapecreators.com)** — 100 free credits, then pay-as-you-go. No subscription required. Sign up and add your key:
 
 ```bash
-echo 'APIFY_API_TOKEN=apify_api_...' >> ~/.config/last30days/.env
+echo 'SCRAPECREATORS_API_KEY=sc_...' >> ~/.config/last30days/.env
 ```
 
-The shared Apify client wrapper is designed for future Facebook and Instagram sources using the same token.
-
 ---
 
 ## What's New in V2.5
@@ -1107,7 +1105,7 @@ Thanks to the contributors who helped shape V2:
 | `youtube.com` (via yt-dlp) | Search query | None (public search) |
 | `hn.algolia.com` | Search query | None (public API) |
 | `gamma-api.polymarket.com` | Search query | None (public API) |
-| `api.apify.com` | Search query (TikTok) | APIFY_API_TOKEN |
+| `api.scrapecreators.com` | Search query (TikTok) | SCRAPECREATORS_API_KEY |
 | `api.search.brave.com` | Search query (optional) | BRAVE_API_KEY |
 | `api.parallel.ai` | Search query (optional) | PARALLEL_API_KEY |
 | `openrouter.ai` | Search query (optional) | OPENROUTER_API_KEY |

SKILL.md

@@ -590,7 +590,7 @@ Want another prompt? Just tell me what you're creating next.
 - Sends search queries to Algolia HN Search API (`hn.algolia.com`) for Hacker News story and comment discovery (free, no auth)
 - Sends search queries to Polymarket Gamma API (`gamma-api.polymarket.com`) for prediction market discovery (free, no auth)
 - Runs `yt-dlp` locally for YouTube search and transcript extraction (no API key, public data)
-- Sends search queries to Apify API (`api.apify.com`) for TikTok search and caption extraction (requires APIFY_API_TOKEN, free tier: $5/month credits)
+- Sends search queries to ScrapeCreators API (`api.scrapecreators.com`) for TikTok search and caption extraction (requires SCRAPECREATORS_API_KEY, 100 free credits, PAYG after that, no subscription)
 - Optionally sends search queries to Brave Search API, Parallel AI API, or OpenRouter API for web search
 - Fetches public Reddit thread data from `reddit.com` for engagement metrics
 - Stores research findings in local SQLite database (watchlist mode only)
@@ -602,7 +602,7 @@ Want another prompt? Just tell me what you're creating next.
 - Does not log, cache, or write API keys to output files
 - Does not send data to any endpoint not listed above
 - Hacker News and Polymarket sources are always available (no API key, no binary dependency)
-- TikTok source requires APIFY_API_TOKEN (sign up at apify.com for free $5/month credits, no CC)
+- TikTok source requires SCRAPECREATORS_API_KEY (sign up at scrapecreators.com, 100 free credits, PAYG, no subscription)
 - Can be invoked autonomously by agents via the Skill tool (runs inline, not forked); pass `--agent` for non-interactive report output
 
 **Bundled scripts:** `scripts/last30days.py` (main research engine), `scripts/lib/` (search, enrichment, rendering modules), `scripts/lib/vendor/bird-search/` (vendored X search client, MIT licensed)