chore(release): bump version to 0.8.0

v0.8.0 Release - Budget Tracking & Quota Management

All 6 phases completed:
✅ Phase 1: BudgetConfig structure (30 min)
✅ Phase 2: Core quota logic (45 min)
✅ Phase 3: DataStore integration (20 min)
✅ Phase 4: TUI Costs tab gauge (30 min)
✅ Phase 5: Web Costs page section (30 min)
✅ Phase 6: Tests + docs (15 min)

Features:
- MTD cost calculation with token-based prorata
- Monthly projection with simple daily average
- 4-level alert system (Safe/Warning/Critical/Exceeded)
- TUI quota gauge with color-coded progress bar
- Web quota section with REST API endpoint
- Full test coverage (344 passed)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: FlorianBruniaux

Cargo.toml

@@ -3,7 +3,7 @@ resolver = "2"
 members = ["crates/*"]
 
 [workspace.package]
-version = "0.7.1"
+version = "0.8.0"
 edition = "2021"
 rust-version = "1.85"
 license = "MIT OR Apache-2.0"
@@ -85,9 +85,9 @@ arboard = "3"
 comfy-table = "7"
 
 # Internal crates
-ccboard-core = { version = "0.7.1", path = "crates/ccboard-core" }
-ccboard-tui = { version = "0.7.1", path = "crates/ccboard-tui" }
-ccboard-web = { version = "0.7.1", path = "crates/ccboard-web" }
+ccboard-core = { version = "0.8.0", path = "crates/ccboard-core" }
+ccboard-tui = { version = "0.8.0", path = "crates/ccboard-tui" }
+ccboard-web = { version = "0.8.0", path = "crates/ccboard-web" }
 
 [profile.release]
 opt-level = "z" # Optimize for size (critical for WASM bundle)