Rename product TallyFlow IoT → TallyFlow Edge across vault

Update product naming in docs, marketing, architecture, use cases,
and capabilities materials. Rename related notes, screenshot folder,
and marketing image filenames. Keep git/repo identifiers (e.g.
tallyflow-iot) and generic industry IoT language unchanged.

TallyFlow/TallyFlow-Architecture.md

@@ -32,7 +32,7 @@ TallyFlow is built around exactly **five primary components**, with **Core** as
 - Focused on quality control and visual documentation
 - Sends data to Core via API
 
-### 5. IoT
+### 5. Edge
 - Rust-based service
 - Integrates fixed RFID readers (Impinj, Zebra, ATID ATF862 / Invengo XC-RF861 — same reader rebranded) and environmental sensors
 - Pushes tag events and sensor data to Core (optional / dashed connection)
@@ -42,7 +42,7 @@ TallyFlow is built around exactly **five primary components**, with **Core** as
 
 ## Data Flows
 - **Assets, Print, Capture** → Core: Solid lines (primary flows)
-- **IoT → Core**: Dashed line (optional, event-driven)
+- **Edge → Core**: Dashed line (optional, event-driven)
 - **Print** additionally supports asset registration back into Core
 - Core Web UI communicates with Core Backend via the same API used by other components