merge: resolve conflicts from origin/dev into PR #1495

- Use PR branch (dev-nofxi) as authority for agent/ module code
- Merge dev's newer model names (MiniMax-M2.7, deepseek-v4-flash)
  with PR's blockrun provider entries
- Fix duplicate agent init in main.go, keep defer-based Stop()
- Fix var type bug in store/ai_model.go (model → models)
- Remove dev-only test files incompatible with PR's evolved agent code
  (to be re-synced after merge)

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

store/ai_charge.go

@@ -22,18 +22,20 @@ func (AICharge) TableName() string { return "ai_charges" }
 var modelPrices = map[string]float64{
 	"deepseek":          0.003,
 	"deepseek-reasoner": 0.005,
+	"deepseek-v4-flash": 0.003,
+	"deepseek-v4-pro":   0.01,
 	"gpt-5.4":           0.05,
 	"gpt-5.4-pro":       0.50,
 	"gpt-5.3":           0.01,
 	"gpt-5-mini":        0.005,
-	"claude-opus":        0.12,
-	"qwen-max":           0.01,
-	"qwen-plus":          0.005,
-	"qwen-turbo":         0.002,
-	"qwen-flash":         0.002,
-	"grok-4.1":           0.06,
-	"gemini-3.1-pro":     0.03,
-	"kimi-k2.5":          0.008,
+	"claude-opus":       0.12,
+	"qwen-max":          0.01,
+	"qwen-plus":         0.005,
+	"qwen-turbo":        0.002,
+	"qwen-flash":        0.002,
+	"grok-4.1":          0.06,
+	"gemini-3.1-pro":    0.03,
+	"kimi-k2.5":         0.008,
 }
 
 // GetModelPrice returns the price per call for a given model