feat: replace Redis with PostgreSQL for caching, rate limiting, SMS codes, and token blacklist

- Add 4 PG entities: VerificationCode, RateLimitEntry, TokenBlacklistEntry, CacheEntry
- Add 4 services: VerificationService, RateLimitService, TokenBlacklistService, CacheService
- Add CleanupBackgroundService for periodic expired data cleanup
- Add MigrationHelper for safe schema migration without data loss
- Update AuthController: real SMS code generation, rate limiting, logout endpoint with JWT blacklist
- Update JwtProvider: add JTI claim for token revocation
- Update Program.cs: register new services, JWT blacklist validation, DB migration
- Remove StackExchange.Redis NuGet package and all Redis config references
- Update start-dev.bat: 6→5 services, remove Redis startup
- Update docs: remove Redis references from all documentation
- Fix: logout button spacing on profile page
- Fix: .gitignore data/→/data/ to not ignore Infrastructure/Data/

backend/src/HealthManager.Infrastructure/Data/MigrationHelper.cs

@@ -0,0 +1,55 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace HealthManager.Infrastructure.Data;
+
+public static class MigrationHelper
+{
+    public static async Task EnsureNewTablesAsync(AppDbContext db)
+    {
+        var sql = """
+            CREATE TABLE IF NOT EXISTS "VerificationCodes" (
+                "Id" uuid PRIMARY KEY,
+                "Phone" text NOT NULL,
+                "Code" text NOT NULL,
+                "Type" text NOT NULL DEFAULT 'login',
+                "ExpiresAt" timestamptz NOT NULL,
+                "IsUsed" boolean NOT NULL DEFAULT FALSE,
+                "CreatedAt" timestamptz NOT NULL DEFAULT now()
+            );
+            CREATE INDEX IF NOT EXISTS "IX_VerificationCodes_ExpiresAt" ON "VerificationCodes" ("ExpiresAt");
+            CREATE INDEX IF NOT EXISTS "IX_VerificationCodes_Phone_Type" ON "VerificationCodes" ("Phone", "Type");
+
+            CREATE TABLE IF NOT EXISTS "RateLimitEntries" (
+                "Id" uuid PRIMARY KEY,
+                "Key" text NOT NULL,
+                "Count" integer NOT NULL,
+                "WindowStart" timestamptz NOT NULL,
+                "ExpiresAt" timestamptz NOT NULL
+            );
+            CREATE UNIQUE INDEX IF NOT EXISTS "IX_RateLimitEntries_Key_WindowStart" ON "RateLimitEntries" ("Key", "WindowStart");
+            CREATE INDEX IF NOT EXISTS "IX_RateLimitEntries_ExpiresAt" ON "RateLimitEntries" ("ExpiresAt");
+
+            CREATE TABLE IF NOT EXISTS "TokenBlacklistEntries" (
+                "Id" uuid PRIMARY KEY,
+                "Jti" text NOT NULL,
+                "UserId" uuid NOT NULL,
+                "ExpiresAt" timestamptz NOT NULL,
+                "CreatedAt" timestamptz NOT NULL DEFAULT now()
+            );
+            CREATE UNIQUE INDEX IF NOT EXISTS "IX_TokenBlacklistEntries_Jti" ON "TokenBlacklistEntries" ("Jti");
+            CREATE INDEX IF NOT EXISTS "IX_TokenBlacklistEntries_ExpiresAt" ON "TokenBlacklistEntries" ("ExpiresAt");
+
+            CREATE TABLE IF NOT EXISTS "CacheEntries" (
+                "Id" uuid PRIMARY KEY,
+                "Key" text NOT NULL,
+                "Value" jsonb NOT NULL,
+                "ExpiresAt" timestamptz NOT NULL,
+                "CreatedAt" timestamptz NOT NULL DEFAULT now()
+            );
+            CREATE UNIQUE INDEX IF NOT EXISTS "IX_CacheEntries_Key" ON "CacheEntries" ("Key");
+            CREATE INDEX IF NOT EXISTS "IX_CacheEntries_ExpiresAt" ON "CacheEntries" ("ExpiresAt");
+            """;
+
+        await db.Database.ExecuteSqlRawAsync(sql);
+    }
+}