chore(sync-about): count public indicator types, not module files (#70)

* chore(sync-about): count public indicator types, not module files

The sync-about workflow counted `mod xxx;` lines in
crates/wickra-core/src/indicators/mod.rs to derive the indicator count
that gets propagated to README, the GitHub About description, and the
wiki. That under-reported by one because `vwap.rs` exports two public
types — `Vwap` (cumulative) and `RollingVwap` (finite window) — from
the same module. The bindings reach both, so users see 214 indicators
even though there are only 213 source files.

Fix the count by parsing the canonical `pub use indicators::{ ... }`
block in lib.rs, dropping the `FAMILIES` constant and any `*Output`
companion structs, and counting the remaining public types. Pure-shell
implementation so the workflow doesn't grow a python dependency.

Sync README to the corrected count (213 -> 214) in the same commit so
the PR validates cleanly through the workflow's PR-flow.

* docs(bindings): sync per-binding READMEs and docs/ pointer to 214 / 16

The bindings/{node,python,wasm}/README.md files (which ship to
npm / PyPI / npm again) and docs/README.md (the pointer to the
wiki) all carried the stale '71 streaming-first indicators across
eight families' header from before the family expansion. Pull the
canonical 16-family table out of the main README into all three
binding READMEs and update docs/README.md to list every family by
name, so a user landing on PyPI / npm sees the current catalogue
shape.

docs/README.md

@@ -8,10 +8,12 @@ That includes:
   [Python](https://github.com/kingchenc/wickra/wiki/Quickstart-Python.md),
   [Node](https://github.com/kingchenc/wickra/wiki/Quickstart-Node.md), and
   [WASM](https://github.com/kingchenc/wickra/wiki/Quickstart-WASM.md).
-- A per-indicator deep dive for every one of the **71 indicators** across
-  the eight families (Moving Averages, Momentum Oscillators, Trend &
-  Directional, Price Oscillators, Volatility & Bands, Trailing Stops,
-  Volume, Price Statistics) — see the
+- A per-indicator deep dive for every one of the **214 indicators** across
+  the sixteen families (Moving Averages, Momentum Oscillators, Trend &
+  Directional, Price Oscillators, Volatility & Bands, Bands & Channels,
+  Trailing Stops, Volume, Price Statistics, Ehlers / Cycle DSP, Pivots &
+  S/R, DeMark, Ichimoku & Charts, Candlestick Patterns, Market Profile,
+  Risk / Performance) — see the
   [indicators overview](https://github.com/kingchenc/wickra/wiki/Indicators-Overview.md).
 - **Reference pages**: [warmup periods](https://github.com/kingchenc/wickra/wiki/Warmup-Periods.md),
   [streaming vs batch](https://github.com/kingchenc/wickra/wiki/Streaming-vs-Batch.md),