docs(ssa): Complete intelligent dialogue and tool system architecture design

Architecture Design:
- Add intent recognition and dialogue architecture design (Intent Router + DataContext)
- Add tool system planning (4-layer 7-tool fusion solution: READ/INTERACT/THINK/ACT)
- Add 4-layer 7-tool implementation mechanism details (Conversation Layer LLM + Node.js orchestration)

Development Plan (v1.2):
- Create 6-phase development plan (134h/22 days) for intelligent dialogue system
- Add 8 architectural constraints (C1-C8): no Function Calling, Postgres-Only cache,
  streaming output, context guard, Zod dynamic validation
- Correct Session Blackboard to use CacheFactory (Postgres-Only, no Redis)

Status Updates:
- Update SSA module status: QPER complete + dialogue architecture design complete
- Update system-level status: add SSA architecture design milestone

Other:
- R tools minor fixes (chi_square, correlation, logistic_binary, mann_whitney, t_test_paired)
- Frontend AIA chat workspace style adjustment

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-v2/src/modules/aia/styles/chat-workspace.css

@@ -1020,4 +1020,4 @@
   border-radius: 4px;
   font-family: 'Monaco', 'Consolas', 'Courier New', monospace;
   font-size: 0.9em;
-}
+}