Centralize all path management via src/config/paths.ts

- Add getPaths() with workspace, scripts, ppt skin/template paths
- Export getWorkspacePath(args?) helper — removes duplicate local functions
  and stale process.cwd()/workspace fallbacks from sqlite, pdf, excel,
  image, pubmed, email, audio-transcribe (7 files)
- weather.ts: replace __dirname-relative scripts path with getPaths().scripts
- Move ppt/ to .smallclaw/skills/presenter/ppt/; update server-v2.ts,
  pptx.ts, pptx_gen.py (argparse --skin-dir/--template-dir)
- Fix PPT skin thumbnail serving: res.sendFile → fs.createReadStream
  (bypasses send module dotfiles restriction for .smallclaw/ paths)
- Fix workspace default: .smallclaw/workspace (was project root workspace/)
- Fix subagent paths to use SMALLCLAW_DATA_DIR env var
- Fix Monaco marked module load failure: restore define.amd on
  DOMContentLoaded after deferred UMD libs (tone, magenta) have loaded
- Add AudioContext resume on first user click (Chrome autoplay policy)

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

.smallclaw/config.json

@@ -107,7 +107,7 @@
   "ppt": {
     "engine": "python",
     "template": "business",
-    "skin": "cream",
+    "skin": "coral",
     "unsplash_key": "env:UNSPLASH_ACCESS_KEY",
     "pexels_key": "env:PEXELS_API_KEY",
     "pixabay_key": ""
@@ -117,6 +117,10 @@
     "interval_minutes": 30,
     "workspace_file": "HEARTBEAT.md"
   },
+  "workspace": {
+    "path": "/home/kim/homeclaw/.smallclaw/workspace",
+    "codeDir": "code"
+  },
   "agents": [
     {
       "id": "pubmed_researcher",