feat(book): add comprehensive technical diagrams — data flows, security, protocols, pipelines

- eBoot: +2 (secure boot chain, firmware update pipeline) = 5 total
- eAI: +2 (8-layer security, sensor-to-action data flow) = 4 total
- eIPC: +2 (wire protocol format, transport comparison) = 3 total
- eDB: +2 (query execution pipeline, replication architecture) = 3 total
- All others: +2 each (product-specific flows + pipelines) = 3 each
- Total: 45 colorful technical diagrams across 14 products

Author: srpatcha

docs/book/book.md

@@ -440,6 +440,9 @@ var (
 
 ### 7.1 Frame Layout
 
+![Figure: eIPC Wire Protocol Frame Format — header fields, payload, and HMAC integrity](images/wire-protocol.png)
+
+
 ```
 [magic:4][version:2][msg_type:1][flags:1][header_len:4][payload_len:4][header][payload][mac:32?]
 ```
@@ -541,6 +544,9 @@ func DefaultCodec() Codec  // Returns JSONCodec
 
 ### 10.1 Transport Interface
 
+![Figure: eIPC Transport Layer Comparison — TCP, UDP, Unix Socket, Shared Memory, Serial](images/transport-comparison.png)
+
+
 ```go
 type Transport interface {
     Listen(address string) error